The trio are lounging on the golf cart. "Dude, what are we going to do this weekend? Nothing's going on." Mordecai said. "I don't know." Rigby said. "Wow, what a great answer." (Y/n) said sarcastically, and Mordecai snickers. "Yeah, you got any better ideas?" Rigby asked. Silence... "That's what I thought." Rigby rolls his eyes, and so does (Y/n). The trio hear a golf cart coming towards them. Mordecai gasps. "Dude, it's Benson." He said. Mordecai and Rigby quickly gulp down the soda,

throw the cans away, and clean the cart, as Muscle Man drops off Pops and Benson. "Alright, so that's tonight. Don't forget it. And be sure to tell (Y/n)." Muscle Man said, reminding Benson. "We'll be there." Benson said. "See you there." Muscle Man drives away in the cart. "What was that all about?" Mordecai asked. "Yeah, tell you what?" Rigby asked the girl, who shrugs. "I don't know." She said.

Pops then approaches them. "Oh hey (Y/n)! Muscle Man just wanted us to inform you that you've been invited to his party." Pops said. "Oh, Mordecai and Rigby. What costumes are you going to wear?" He asked. "Costumes?" The trio asked. "Muscle Man's throwing a birthday party for Hi Five Ghost. Apparently, it's a costume birthday party." Benson said. "Let me see." Rigby said. "Ah, what? It's invite only." Mordecai said. "You guys got invited, right?" Benson asked the duo.

"We didn't even know there was a party. Did you know there was a party?" Mordecai asked. "No, I did not." Rigby said. "Me either, and apparently I was invited." (Y/n) said. "You were." Benson said. "We didn't even know there was a party." Mordecai repeated. "Oh, well..." Benson snatches the invitation. "Maybe you two weren't invited." He said. The trio stared at each other. Muscle Man puts a lot of cans of soda into an ice bucket. "Hey, Muscle Man. Uh... we heard that you're having a party tonight. What time should we show up?" Mordecai asked.

"NEVER, YOU'RE NOT INVITED!" Muscle Man then turns to see (Y/n). "But I'm looking forward to seeing you there, pretty lady." He said, and the duo growl slightly. "You're coming right?" He asked her hopefully. "Uh..." she looks at her best friends then back at him. "Of course! Wouldn't miss it." She said, and he smiles, and her best friends look at her in disbelief. "Alright!" He gets back into the golf cart. "See you there, pretty lady!" He drives off and the duo glare at her. "What?" She asked.

"What the hay, (Y/n), so you're still going to go even if we weren't invited? We're your best friends!" Rigby sounded kind of hurt. "Look, I'm sorry, but he did invite me, and... I'd feel bad if I didn't show up, you know? He's kind of a friend of mine too." (Y/n) said. Rigby sighs, then groans. "Fine." He crosses his arms angrily. "What's his problem? Why won't he invite us to his party?" Rigby asked Mordecai. "Dude. I know why he's not inviting us to the party." He replied. "Really?" (Y/n) raised an eyebrow. "Why?" Rigby asked. "Remember when you were choking this morning?"

~Flashback~

Rigby is choking loudly in the kitchen. Muscle Man laughs. "Look at Rigby's face." He said, and (Y/n) instantly panics. "Oh no, he's choking!" She walks over to Rigby. "Don't worry, dude. I gotcha." Muscle Man continues laughing until Rigby throws up his spit wad, which then gets in his soda and splashes in his face. "Aw, sick! Your choke wad spat soda in my face!" He whines hysterically.

~Present~

"Dude, that wasn't our fault, I was gonna die. And besides, we got him a new soda." Rigby said.

~Flashback~

Muscle Man is still whining about the soda on his face. "Ugh, quit whining. Here's another soda, you big baby." Rigby holds the glass of soda, but trips over the soda can, splashing more soda into Muscle Man's face. "Uh oh..." Muscle Man then goes into a ballistic frenzy, pushing the table against the wall, then whamming on it, and lying on the floor still whining.

~Present~

"Yep, that's probably why he's not inviting us to his party. We gotta go apologize." Mordecai said. The trio walk to Muscle Man's trailer. Rigby then knocks on the door. "What?" Muscle Man asked. "Hey, Muscle Man. We're sorry about that soda thing this morning, so we bought our console as a peace offering. You can borrow it for your party." Mordecai said. "One, I don't know what you're talking about and B, I'm busy.

But I'll still take your video game." He swipes the system from Mordecai and Rigby, then closes the trailer door. "Yo, H.F.G.! I found a video game system on the ground. Let's see what happens when we put it in the microwave." He said. "Dude, you said that was gonna work." Rigby said. Mordecai sighs. "I know, I know." He said. "He'd better not trash our system. That thing wasn't cheap." Rigby said.

"Come on!" Mordecai said. Later the trio drive the cart and see Muscle Man prepare the decorations for the party. "Ugh! Man, he's not gonna invite us. We already said sorry. What else can we do?" Rigby asked. Mordecai comes up with an idea. "Oh, I know what to do." He said. "What?" Rigby asked. "We just have to make Muscle Man think that we don't wanna go to his party." Mordecai said. "What?" Rigby asked. "Reverse psychology. If he thinks we're not into it, then he'll really want us to be there." Mordecai said.

"Ohhhhh...nice." Rigby said. "Just act like the party's lame and watch the invitations come rolling in." Mordecai said. "Are you sure that's going to work?" (Y/n) asked skeptically. "He seems pretty dead set on not wanting you guys there anyway." (Y/n) said, and the duo glare at her. "Sorry." She said quickly. Later the trio drive the cart over to Muscle Man as he is in the middle of the decoration preparation.

"Muscle Man, we don't wanna go to your party." Mordecai said. "Good, because I wasn't gonna invite you anyway, so get lost!" Muscle Man shouted. "Muscle Man, we're sorry about the soda." Mordecai tried again. "What are you talking about?! I said GET LOST!!!" Muscle Man shouted. "Ugh, forget it." Mordecai hits the gas pedal, spins the cart, and drives away. Later at nighttime,

Mordecai and Rigby are lying on their beds as (Y/n) stands in between them. "Why are you still here? Shouldn't you be at Muscle Man's party?" Rigby asked bitterly through gritted teeth, and (Y/n) sighs. "I don't think I should go." She said. "What, why?" Mordecai asked. "Because you two weren't invited. I don't think it will be as fun without you." She admitted. Rigby sighs.

"Oh so now you don't want to go because we weren't invited?" Rigby asked, and (Y/n) rolls her eyes. Rigby does too, then turns to Mordecai. "Wanna play some video games?" He asked. "We gave away our system, remember?" Mordecai asked. "Well, whatever. The party's gonna be lame, anyway. It's just gonna be Pops, Skips, and Benson sitting around doin' nothing." Rigby said.

The trio sit up as they hear thumping bass music from outside. Looking out the window they see what appears to be a rocking party taking place in a tent in the middle of the park. "Whoaaaa..." the trio said. "So, what was that about saying you didn't want to go to that party?" Mordecai asked, and (Y/n) rolls her eyes. "Oh, I know!" Rigby said. "What is it?" Mordecai asked. "Since you were invited, maybe you can help us sneak in. I mean it won't seem suspicious to anyone if you're helping us, right (Y/n)?" Rigby asked. "Uh... yeah, I guess so." She said.

A bunch of unidentified guests are in costumes. Mordecai and Rigby show up wearing unconvincing cat and dog masks, respectively while (Y/n) wears her costume. "Guys, this is amazing." Mordecai said. They encounter a huge, muscle-bound bouncer, Bobby, at the tent entrance. "Hold up! You're not on the list." Bobby said. "What? How do you know we're not on the list?" Rigby asked.

"Name?" Bobby asked. "(Y/n), Mordecai and Rigby." Mordecai said. Bobby checks the list. "Oh, well (Y/n)'s on the list, but the two of you aren't. I can only let people in that's on the list." Another guest walks past. "Yo, hold up! You're not on the list." He said. Muscle Man appears at the window. "Ey, yo, Bobby! You can let that guy in. He seems legit. Wooooo! Let's keep this party goin'!" Muscle Man said. "Right this way, sir." Bobby said. "Okay, uncool." (Y/n) mumbles.

"Aw, what? He didn't even have a costume." Mordecai said. "Yeah, what the H, Bobby?" Rigby asked. (Y/n) sighs, but then a mischievous smirk forms. "(Y/n), I know that look. What you are plotting?" Mordecai demands, and Rigby looks at her curiously. "Follow me, guys. I got an idea." The trio appear around the back of the tent house, the duo without their masks on. "Come on. We'll just go through the window." (Y/n) said. She struggles to open the window. A ghost, looking exactly like Fives except with stubble, appears through the tent wall holding a soda can and wearing shades. "Hoo! Par-tay!" He shouted. "Hey, it's fives!" Rigby said.

"Happy birthday, fives!" The trio said. "What?' The ghost asked. " Whoa, sorry. We thought you were someone else." (Y/n) said, and he laughs. "Kid, I'm not Hi Five Ghost, I'm his brother, Lo-Five Ghost. What're you guys doing out here? The party's inside! Woo!" He said. "Haha, yeah... we... weren't really invited. Well, me and Rigby weren't anyway." Mordecai said.

"What? Why not?" Lo-Five Ghost asked. "That's what we wanna know. We don't really care - we just wanna get in." Rigby said. "OK, look. I'm not supposed to say this but, if you really wanna get into the party, I can turn you into a ghost." Lo-Five Ghost. "Really?" The trio asked. "Yeah, then you won't have to go through the door. You can go through the wall. Plus, your costumes will be a lot more believable. So, what do you say? You guys wanna do it?"

Lo-Five Ghost asked. "Let's do it!" Mordecai said. "OK, yeah!" Rigby said. "Are you two sure about this?" (Y/n) asked. "Something seems kind of fishy to me here." She said. "Oh, it'll be fine." Rigby said. "Ha ha! Alright! Up high, Down low." The two are transformed into ghosts by the power of hi- and lo-fiving. "...Now you're ghosts." Lo-Five Ghost said. "Whoa..." (Y/n) said in awe. "You can be a ghost too if you want." Lo-Five Ghost said, and she quickly put her paws up. "Uh, no thanks. I'm good." She said, and he shrugs. "If you insist." He said. "Aw, man. This is so cool..." Mordecai said. "Dude, dude, punch me in the face!" Rigby said. "OK." Mordecai swings a punch at Rigby, who squeals in pain.

"Nooooouuaaaoow! I thought stuff's supposed to go through us." Rigby said. "Well, yeah, real stuff if you want, but not other ghosts. Woooooo! Party!" Lo-Five Ghost said. Inside, Pops is dressed like an ice cream cone, Benson like a vampire, and Hi Five Ghost is wearing an eyepatch. "(Y/n), Mordecai and Rigby, hello!" Pops said. "Hey, happy birthday!" Mordecai said. "Yeah, happy birthday!" Rigby said. "Happy birthday." (Y/n) also said. "Thanks!" Fives replied. "So, you guys got invited after all?" Benson asked the duo. "Hmm! Hmm!" Rigby said.

"Hmm! Hmm! You could say that." Mordecai said. "What wonderful costumes!" Pops said. "Ha! These aren't costumes." Rigby said. "Wait, those aren't costumes?" Hi Five Ghost asked. "Yeah, no, we're totally ghosts." Mordecai said. "Yeah, your brother turned us into ghosts so we could sneak in here and wish you a happy birthday." Rigby said. "Oh no. This is bad." Hi Five Ghost said. "What do you mean...?" (Y/n) asked suspiciously. "(Y/n), your best friends got bigger problems.

If they don't get turned back into themselves soon, they'll be stuck as ghosts forever." Hi Five Ghost said. "What?" The trio asked. "Well change us back!" Mordecai said. "I can't. I don't know how." Hi Five Ghost said. Hi Five Ghost angrily confronts his brother at a snack table. "Dude! You turned them into ghosts?! Change them back!" He shouted. "I don't know how to! But... maybe dad knows." Lo-Five Ghost said. Back in the middle of the party, they speak to Hi Five Ghost's Father.

"Hmm. Not good. Not good at all. If you want to turn back into yourselves, you have to scare someone." He said. "Scare someone?" Mordecai asked. "Yes. It's the only way." Hi Five Ghost's Father. "Dude, let's scare Muscle Man. He doesn't know we're here yet, so he won't be expecting it." Mordecai said. "OK, let's do it!" Muscle Man appears at the top of the stairs. "Oh, man! I gotta use it!" "He's going to the bathroom. Quick, hide!" They run into the bathroom and turn off the light. Muscle Man opens the door and turns on the light, at which point Mordecai and Rigby scream at him. Muscle Man yells in shock, and grabs his chest, falling to the ground.

"What's he doing?" Rigby asked. "Oh no. He's having a heart attack!" Mordecai and Rigby drag Muscle Man into the party room. "We need a doctor!" Mordecai said. "Everyone back up, back up! What happened?" Hi Five Ghost's Father asked. "We scared him... and he fell over!" Mordecai said. "OK, step back, let him breath." He checks his breath. "He's not breathing!" He begins administering CPR. "... he's gone." The crowd gasps in horror as Hi Five Ghost's Father closes Muscle Man's eyes for the last time. "Oooooooooaaaaugh! You killed my best friend!" Hi Five Ghost shouted. "We're sorry!" Mordecai said. "Yeah, we didn't mean it!" Rigby said.

"Hi Five Ghost, whatever they did was an accident, I'm sure of it!" (Y/n) said. On the ground, Muscle Man's eyes open a tiny bit, before he speaks. "Got you, dudes. Ha ha ha ha! Best, Prank, Ever!" Muscle Man laughs and whoops. (Y/n) turns to him furiously. "What?!" She asked. "What?! What's wrong with you?!" Mordecai asked. "This was a prank?!" Rigby asked. Muscle Man laughs. "Yeah, it was! And you three fell for it!" He said. "Wait. I thought you invited us to a costume party." Benson said. "I did. But that was just the beginning of my plan. "When you jerks spilled soda in my face,

I knew I had to get you back. That's when I decided to throw a party. I invited people and I made sure that you were aware of that. Then we bailed Fives' brother out of jail so he could turn you into ghosts. It was the ultimate prank. The ultimate payback." Muscle Man said. "Wait... but if you wanted to prank us at the party, how come you didn't invite us?" Mordecai asked. "Easy: not inviting you two and inviting (Y/n) was the only way

I knew you'd show. I knew she'd try to sneak you guys in since you three are so close. Plus, it was also worth it to see your jealous faces! It's called reverse psy-cho-logy, babies!" Muscle Man pronounces the ch- in psychology like the ch- in chew. "Ha ha ha ha!" He laughs. "Augh!" The trio said. "This is the lamest and most expensive prank ever." Rigby said. "Ha ha ha ha! And it was worth it.

Maybe next time you'll think twice before spilling soda in my face." Muscle Man said. "Yeah, we'll definitely think twice." Mordecai said, but (Y/n) wasn't having it. "Seriously?! All of this over something that petty?! It was an accident! It's not like we spilled it on you on purpose! What would be the point of that?!" (Y/n) screeched. Muscle Man and everyone else was at loss for words. "Alright, I'm out of here." Benson said. The guests all start to leave. "Ha ha ha ha! Where you guys goin'? Thee's still plenty of food!" Muscle Man begins to stuff his face with food and laughs. "Ha ha ha ha!"

Muscle Man begins to choke. "Oh, dude, Muscle Man's choking!" Rigby said. "You have to help him! You're a doctor!" (Y/n) said to Hi Five Ghost's Father. "No, I'm not a doctor. That was just part of the prank. Does anyone know the Heimlich?" The remaining guests look to each other helplessly. "Mordecai knows it." (Y/n) said. "Yeah, right, he's just faking it. As soon as I help him, he's going to be all,"

he mimics Muscle Man's voice. "Got you again, dudes!" He switches back to his normal voice. "I'm sick of it." He said. "Huh, you have a good point." (Y/n) crosses her arms. "Ah, lame. Dude, are you pranking us?" Rigby asked. Muscle Man shakes his head as he continues to choke. He falls to his knees. "Dude, he's not pranking us!" The trio shouted. "I got you Muscle Man, I got ya!" Mordecai performs the Heimlich and gets the food out of Muscle Man's throat. "I hope this makes us even." He said. "It does. Lo-Fives, change 'em back." Lo-Five Ghost clicks his fingers and returns Mordecai and Rigby to their normal selves.

"I'm sorry I pranked you guys so hard. Look. It's gonna be a real party, and you guys can stay if you want to." Muscle Man offers his hand, and Mordecai shakes it. (Y/n) smiles at the scene. "So, seriously. Is this a real party or not?" Benson asked. "Does this answer your question?" Muscle Man waves a cassette tape, then throws it towards the tape deck, but misses. "Aw." He said. "No. Doesn't really answer my question." Benson said, and (Y/n) snickers. "I thought I could get it in the tape deck."

He walks over to it and picks up the tape. "Here. Does this answer your question? Everybody, party!" The music starts and the guests all dance. "Can you believe this?" (Y/n) asked her best friends. "No. Hey, next time you see Muscle Man with a soda, can you remind me not to spill it in his face?" Rigby asked. "Yes. Yes we can." Mordecai said. Muscle Man appears with an odd-looking video game system. "Hey guys. I thought you'd like to have this back." Muscle Man said. "Aw, thanks." The trio said. "Hey, wait. Is this just paper mache?" (Y/n) asked. "Yeah, sorry guys. I sold the real one to a pawn shop. It was all a part of the prank." Muscle Man said. "Are you serious?" Mordecai asked. "What's wrong with you?" Rigby asked. "Seriously?" (Y/n) said. Muscle Man pulls the real console from behind his back. "Got ya, dudes."