The scene opens up, showing the top of the haunted house. It pans down to Isabella, who is scared to see the monster. She then hiccups.

“Darn. It didn't work, Phineas.” The monster costume opens and Phineas comes out of it in a mad scientist costume. “What else you got?”

“Wait, that was you?”

“Yeah! Pretty cool right?”

“Oh, we've got plenty, if you're up for it.” Phineas said, holding out his hand to Isabella.

“I--"Hiccups “g-g-guess so.”

Ferb is seen dressed like Frankenstein and playing the organ.

Phineas: ♪ Come, let's tiptoe into the dark ♪

♪ One good scare ought to do ya! ♪

(Screams are heard.)

♪ You'll find our bite much worse than our bark ♪

(Monster dogs howl.)

♪ One good scare ought to do ya some good ♪

♪ If you should find the daily grind, a tad bit taxing on the mind ♪

♪ To help unwind, if so inclined ♪

♪ I have a small suggestion ♪

♪ That if you dare into my lair, you should prepare for quite a scare! ♪

♪ But "Will you share in this nightmare?" would be my only question ♪

“I just realized something. What’s with all the musical numbers?” Adyson asked Phineas. He just shrugged.

“I like it.”

They enter a room and see Baljeet dressed as a test

“Boo, boo, I say!” Baljeet said.

“Baljeet?” Phineas asked, confused.

“Oh, I am not Baljeet. I am the scariest thing known to man, a failed math test.” Baljeet said.

“Um”

“Yeah, right. We're just gonna move on now.” Phineas said after a pause.

“You can run, but it won't be to the college of your choice, I tell you!”

“Too soon, Baljeet.” Jeremy said, not looking forward to that horror.

Phineas: ♪ If your hair lies lifeless and limp ♪

♪ One good scare ought to do ya! ♪

(Screaming)

♪ Come with me, now, don't be a wimp! ♪

♪ One little scare ought to do ya some good ♪

They enter another room shrouded in darkness.

“Hello? Buford?” Phineas called out to a figure crouching in a dark corner

“Behold; the face of evil.” Buford comes out, revealing himself to be dressed as Suzy Johnson.

“Buford, are you supposed to be Jeremy's little sister? You said you were gonna be something scary!” Phineas said in disbelief.

“This make a whole lot more sense now.” Phineas said.

“She is scary, man. She gives me the willies.”

The song stops at Buford’s words.

“Little Suzy Johnson gives you the willies?” Phineas asked skeptically

“You don't know, man. You don't know.” Buford said desperately.

“Um...we'll catch up with you later, okay?”

“Wash away the horror. Wash away the horror.” Buford chanted, washing his hands relentlessly while Phineas and Isabella slowly back away from the room.

“What did she do to you?” Baljeet asked Buford.

“You don't want to know.”

The song continues as they go up surrounded by bats.

Phineas: ♪ That is quite right, I would delight in taking flight into the night! ♪

♪ If I may give you such a fright, you know I surely would ♪

♪ But if I seem a bit extreme in my attempts to make you scream ♪

♪ Remember this spooky scheme will cure your hiccups for good ♪

♪ One little (X4) ♪

♪ One little scare ought to do you some good! ♪

They reached the top room with the organ, where Ferb laughs maniacally.

“I must admit boys. You did quite a good job at this haunted house.”

“Lawrence!”

“What?”

“So, Isabella, did it work?” Phineas asks. Isabella goes to answer but she hiccups.

“I was afraid she would say that. Well, there's one more thing we could try.”

Scene shifts to Candace panting while riding her bike down the sidewalk, Suzy's poodle still on her helmet. She stops when she reaches her neighborhood.

“What the-?” Candace and Suzy's poodle eyes widen, and the poodle jumps off her helmet and runs off in fear. “What the-?”

The scene shifts to reveal her seeing the haunted house from the backyard. “I don't believe this.”

“Looks like you’re back on the job.”

Cut back to Perry and Doofenshmirtz.

“Let me get this straight. If I set you free, you'll give me the keys, right?” Doofenshmirtz asked, and Perry nods. “Oh, for Pete's sake, why didn't you say that, like, an hour ago?”

“He’s kidding, right?”

He pushes a button, and the arm and leg restraints unlock. Perry lifts his feet to reveal the keys. “Oh, look, they were under your cute little platypus foot the whole time.”

“Why does everyone think Perry’s cute? I don’t get it.”

“Candace, if you think he’s not cute then you need glasses.” Stacy responded.

He takes the keys and laughs, quickly running to his jet. “Hurry, open, open, open. Now I grab my stuff. Hurry, hurry, hurry, must hurry. Seat belt, and ignition!” he presses the ON button, and the engine starts whirring. “Whew! That was close!” he laughs in relief and turns to look at his stuff.

“Wait, where’s Perry?”

“Now, let's just make sure I didn't forget anything in my haste. Let's see, I've got my old basketball, the lamp, the Christmas lights, the umbrella, Perry the Platypus, the Disintevaporator, my golf -- PERRY THE PLATYPUS?” A dramatic shock sound plays. “THE DISINTEVAPORATOR?!” the dramatic shock sound plays again. “MY GOLF CLUBS?!? I don't even play golf! Oof!”

Perry jumps on him, and he and Doofenshmirtz start fighting.

“Did he accidentally take Perry with him or did Perry get in the jet by himself?” Phineas asked.

“Why do you ask?” Lawrence responded.

“Because Perry looks a little confused.”

Doofenshmirtz pulls Perry away from his face and throws him away. He jumps on Perry’s face, doing the same move Perry was doing on him. “How do you like it, huh?”

“Is that a normal thing?”

“It’s Perry’s signature move.”

“Agh! Wait, wait, wait. Hold on. Time, time, time. I got a hair caught in my mouth. Blagh.” He takes the hair out but then quickly takes the Christmas lights, throwing them at Perry. Perry gets entangled in them, and he is thrown back to a lever.

An alarm starts beeping as the hatch opens mid-air. Perry seems to be struggling to stay in the plane against the force of the wind. “Since you saved me the trouble of opening the hatch, let me show you out!” Doofenshmirtz tilts the plane, and Perry falls out, hanging on by the Christmas lights.

“I thought you said your dad doesn't hurt him too much!”

“He's still a secret agent Phineas. He's going to get hurt sometimes.”

Scene shifts to the backyard, where Candace has gotten a closer look at the haunted house.

“Those two are in such big trouble!” She said.

Inside the haunted house:

“Okay, Ferb, raise the antenna.” Phineas said. Ferb started turning a lever, and a green antenna came out of the top of the house.“Let's see if we can up the scariness factor. You see, our haunted house is powered by static electricity. Maybe we can get a lightning strike to fire things up.”

“Okay, that’s definitely dangerous.” Linda said.

Candace opens the door to the haunted house, hesitantly walking in. “Um, hello? Phineas? Ferb? You two are in big trouble?” the door slams as soon as she gets in, the wind blowing ominously. Candace runs and tries to open the door, but it’s locked. “Okay, you guys, stop fooling around.”

“Oh this is going to be great.” Stacy crackled.

“Some friend you are.”

“You guys better come out now. I'm getting really mad.” Skeleton cracking is heard behind her, and Candace turns around only to see nothing. “What was that?”

She then turns back around and sees a monster and screams. She runs off into the haunted house, not noticing the monster taking its head off to reveal Milly, Ginger, and Gretchen

“Yeah!” they yelled together, giggling.

“That was you guys?!”

“Yup!” 

Candace goes into a hallway and opens a door where she hears screams. She closes the door and runs towards the camera, only to scream and run back. “Stay away from me!” A floating candlestick stick follows behind her.

She goes into a dark room and pants. Suddenly another pair of eyes appear next to her.

“Good evening.” Someone said in a Transylvanian accent. Candace turns on the light to see a vampire hanging upside down. “It is evening, isn't it?”

“Is that a real vampire?!”

“… We’re not sure.”

Candace screams and runs away, only to run into some more spookables, including a Giant Floating Baby Head.

Meanwhile, the lightning rod picks up too much electricity.

“Whoa, whoa, whoa! Too much, Ferb! Too much! Watch out!” Phineas yelled

“Did it go out of control?”

“A little…”

Candace sees more spookables and runs throughout the house. She runs into Buford and Baljeet and screams at the Suzy costume, making them scream back at her. Candace then runs through more of the house and ends up on the roller coaster and eventually in the top room.

“Candace?” Phineas exclaimed.

“You aren’t a fan of haunted house so I was really surprised to see you there.”

“Phineas! When Mom sees that you've built a haunted house in the backyard with werewolves and vampires and a Giant Floating Baby Head? What's that even about?” the Baby Head coos and bumps lightly into Candace. “Not now!” It floats away, crying. “And then there was a giant Jack-in-the-Box with a suit of armor that nearly took my head off, and you--you just drive me crazy! When I tell Mom what you've been doing, you are going down! Down, down, down!” she walks off after her rant.

“Is there any chance that that cured your hiccups?” Phineas asked Isabella and she hiccups in response.

"Hardy, har har." Candace deadpanned.

Candace enters the elevator but the Giant Floating Baby head is there as well.

“Would you get out of here?!” she yells, and the Giant Floating Baby head exits.

“What is up with that Baby head?” Linda asked the boys.

“We have no idea.”

Cut to Perry swinging from the Christmas lights from the jet. The Christmas lights loop onto the top of the haunted house.

As Candace walks out, the haunted house behind her is starting to be lifted, but she barely notices. She suddenly sees Linda's car offscreen and smiles. 

“Mom's home. Perfect!”

“I can already imagine what happened.”

Candace runs to Linda, who gets out of the car with her groceries. “Mom, Mom, Mom, Mom! Wait till you see what Phineas and Ferb have done!”

The haunted house starts to lift off the ground, and everyone leaves the house, except Phineas, who gets trapped.

“What's happening? Uh, guys? A little hellllllllllllp...!”

“Phineas!”

Phineas falls from the flying house and screams in terror.

“Oh dear!” Lawrence and Linda watched in horror as their son fell from the haunted house.

“Phineas!”

“Quick, everyone! Sashes!” Isabella ordered.

“Hup, hup, hup, hup, hup, hup, hup, hup, hup!” The Fireside Girls flip their sashes out like a trampoline. Phineas bounces off the trampoline and lands right into Isabella's arms.

“Now that...was scary.” She said. “Hey, my hiccups are gone!” Ferb gives a thumbs up.

“Thank you for saving him, girls.”

“No problem Mrs.Flynn-Fletcher.”

“I wonder if Perry know about that?” Vanessa mused.

“Well he did seem really silent that day.”

“Phineas, he’s always silent.” Candace deadpanned.

Cut to Candace and Linda as the Fireside Girls walk out the gate.

“See? Absolute terror! These little creeps destroyed our backyard leaving this ugly mess in its place!” Candace gestures without looking at the backyard. Horror music plays and the camera close-up on Baljeet, who smiles and waves.

“Hi, Baljeet.” Linda greets before looking at Candace. “That wasn't very nice, Candace.” Linda walks inside leaving Candace stunned.

“Did that actually happen or was that just for comedy?” Jeremy asked Candace.

“It actually happened.”

Cut to Perry sliding onto the haunted house, which is being carried by Dr. D's rocket.

“Here you go, Perry the Platypus. Enjoy your disintevaporation!” Doofenshmirtz says and throws the Disintevaporator on the haunted house. The force of the invention hitting the house is enough to break the string of Christmas lights, thus freeing the haunted house.

Perry jumps off of the haunted house and puts on his parachute, escaping safely. The haunted house lands in the backyard with a big sound. Candace turns around, notices it, and smiles widely.

“Ee-ee-ee-ee... It's back! Mom, it's back!” Candace runs into her house to get Linda.

Horror music plays, and the camera zooms in on the timer on the Disintevaporator as it reaches zero. The machine destroys the haunted house, just before Candace drags Linda out.

“Another mystery solved.”

“It's back! I told you! It's returned.”

Baljeet is in the middle of their empty yard again, holding his satchel.

“Oh, excuse me, I forgot my satchel.”

Candace sighed while everyone laughed again.

Linda looks on in anger. Candace stares with a shocked expression on her face.

“Goodbye, Candace...” Linda said flatly, walking back inside and slamming the door.

“What's the matter?” Isabella asked, walking up to Candace.

“Phineas and Ferb are the matter!” Candace said in anger. “This day was ruined, and I didn't even get to hang out with Jeremy!” 

"Technically, that's not our fault."

“Sorry, but you know, it was the best day for me! Due to my incurable case of hiccups, I spent an entire day showered with undivided attention from Phineas! It was wonderful!” Isabella said happily.

“You have really low expectations huh.” Stacy asked, much to Isabella and Phineas’s embarrassment.

“Hiccups?” Candace asked, her mind already making a plan. Isabella nods and leaves just as Jeremy enters.

“Hey, Candace. You ran away so quickly, we didn't get a chance to—"

Candace hiccupped, interrupting him.

“Sounds like you got a bad case of the hiccups.” Jeremy said sympathetically, and Candace hiccups again. “Here, come on. Let's see what we can do about that. I got a glass of water with your name on it.”

“Sooo, did you really have hiccups or…?” Jeremy asked jokingly.

“I’m not saying anything.”

“Alright then.”

They walk by Suzy, and Candace hisses at her

“What? What did I do?” Suzy asked Buford.

“Heh, heh. Um, I- I'll, just uh, go.” Buford said nervously, walking away from her. Ominous music and the camera zooms in on Suzy’s face.

“I’ll have to have a real talk with her soon huh.”

“Isn’t she at some camp this summer?” Stacy asked.

“Yeah, her teachers suggested it. And I think I might know why now.”

Cut to Phineas and Ferb under the tree, with Perry sitting with them.

“That was a great day, Ferb. What did you think the scariest thing was?” Phineas asked.

“Definitely the Giant Floating Baby Head.” Ferb said.

“Yeah...” The ending of the Phineas and Ferb Theme plays but suddenly gets cut off by Phineas. “Yeah, where did that come from?!” Ferb shrugs. “Hm.”

The theme continues.

“Wait, so you didn't know what that floating baby head was doing there?”

“Yeah, it just pops in whenever it wants.”

“I told you. Strange things happen in Danville.”

--------------------------------

Has anyone seen the MWCA yet? If you haven't, then I highly recommend it. It was absolutely delightful!