One Mushroom Kingdom day, at Mushroom Castle, Princess Peach was busy in the kitchen preparing fruit. She was having everyone (collectively known as The Mario Gang or something) over for dinner that night, so she, Princess Daisy and a group of the palace toads were helping. They knew exactly what kind of appetites they had to satisfy, so they had already been preparing for hours. Unfortunately, they simply could never be prepared for the kind of nonsense that could happen at these gatherings.
Daisy was working on a cake for dessert and Blue and Yellow Toad were standing on a chair at the table, kneading bread. "We have a lame job," Blue Toad grumbled under his breath. "Why do we even have to make this much food, anyway?"
"Because Mario is coming," Yellow Toad replied immediately. If you knew how much food they had made, you would probably want to throw up, so I won't tell you. But be assured it was not too much. It could never be too much.
"Yellow Toad," Peach reprimanded. "You know Wario is coming."
"Well isn't that just icing on the cake," he muttered, propping his elbow on the table.
"I haven't put the icing yet," Daisy said.
Then the door burst open and a toad ran in. "Princess, there's a couple of weird hairy guys here."
"You mean Mario and Luigi?" Blue Toad asked. That toad was new.
Daisy raised an eyebrow but didn't say anything.

In the dining room, Mario and Luigi were sitting at the table, bored out of their brains. They had been staring at each other for five straight minutes and were starting to go a little, as Mario would put it, 'cuckoo crazy'. Luigi drummed his fingers on the table. Mario twirled his fork around like only a professional eater could. He felt like drooling but he didn't to avoid messing up the fancy dishes.
Then Lakitu came in leading Yoshi, Birdo, Wario and Toad.
"Hey guys," Yoshi greeted. Then he glanced back at the doorway. "BEWARE."
"Beware what?" Luigi asked, a little worried, but before anyone could answer they heard Waluigi's voice. "WAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA-
"Would you be quiet already?" Mario scolded, standing up. Waluigi strutted into the room like he was awesome or something.
"Hello everyone, guess what? I'm awesome!"
Luigi rolled his eyes in boredom. Then Daisy walked into the room. "Hey guys, glad you could all make it."
"Except Waluigi," Blue Toad whispered to Yellow Toad, who had come in behind her. Yellow Toad nodded sadly.
"It's unfortunate," he said. But he didn't know the half of it.
Waluigi was instantly next to Daisy. "Hey hey, Daisy Mae, wanna do something with me today?"
"Umm, I'm kinda busy today...eating dinner."
"Well, I have to show you something," He said, reaching behind his back. "It's this new-fangled gizmo I got that'll make you green with envy!"
Luigi rolled his eyes again. He hated that expression.
"Uuuuhhh...a banana?" Mario asked, unimpressed.
"Impressed?" Waluigi asked, holding up a banana.
"If this was some sort of partially rotten fruit contest and I was the judge, I would be," Luigi cut in.
"FRUIT!? YOU DARE TO CALL THIS A FRUIT?!"
"Um...yes?"
"This, SIR, is no fruit!" Waluigi cradled the banana. "I'm sorry baby, he didn't mean that," he told it.
"I can see where this is going," Wario commented.
Before it could go any further, Peach walked in. "Hi, everyone! Ready for dinner?"
Before long they were all seated and had been served. They hadn't been eating for two minutes when Waluigi pulled out his banana again.
"Sorry guys, if you'll excuse me, I have to make a call," he said and got up. Everyone stared at him as he went a few paces away and put the banana to his ear. They watched, waiting for him to say he was joking, but it never happened.
"Hi dad, how are things?" he said into the banana. Silence. "No, I'm doing fine. Having dinner with some goons and a girlfriend."
"Uggh," Daisy groaned. "Is he insane?"
"Only on Mondays through Saturdays," Wario informed her.
"Oh, come on, he's not that stupid."
But apparently he was, or at least he was today, because believe what you will, Waluigi stood there talking on the 'phone' for a solid half hour while everyone ate seconds and thirds and dessert. It was getting really stupid after about five minutes, and after fifteen they were sick and tired of it.
From what they could tell, he talked about everything from doing laundry to what the proper term for a baby Yoshi was. Finally, he turned to the table and put a hand over the 'mouthpiece'.  "Hey, Mario, wanna talk to my dad?"
The look Mario shot him was worthy of the record books.
"Umm, Mario's kinda busy right now," Waluigi said. "Well, say hi to mom for me."
"I think he's getting off!" Daisy squealed in excitement. "He's getting off!"
"And I had always thought Wario was the insane one," Luigi shook his head.
"HEY! Is that some kind of insult?" Wario growled. He slammed a fist on the table and all the drinks jumped out of their glasses. Then they all splashed back in without spilling a drop.
"I'm just as insane as, if not more insane than the next guy! Don't you forget it, buddy!"
"Um...okay."
Meanwhile, Waluigi had finally hung up and came back to the table. "Hey guys, thanks for not waiting," he said. Mario groaned and put his head in his hands.
"Well, you know Mario," Wario said. "He can't control his drool for five minutes if there's food within a mile radius."
"Ha, you got that right," Blue Toad said.
"Let's leave me out of this, please!" Mario snapped.
Just then Waluigi dropped his fork. "Oh, another call," he said, reaching for his banana phone which was on the table, in a pile of other fruit.
"NO!" Daisy cried.
Then Waluigi stopped. "Wait...where'd it go?" He got up and scanned the table, but suddenly his banana was gone. He lifted the table cloth and checked the floor. He checked all his pockets. He checked Wario's pockets. Finally he sat down, stumped. "How could a banana just walk away?"
"If a banana can be a working phone, I don't see why it couldn't," Yoshi snorted.
"Real shame," Mario said, flinging a banana peel onto his plate. Waluigi lunged forward and grabbed it.
"No...is this... NOOOOOOOOOOOOOOOOOOO!"
Everyone was staring at him, as if they hadn't already been doing so.
"YOU...YOU EVIL MURDERER! HOW COULD YOU EAT MY PRECIOUS PHONE?!"
"Wait, that was your phone? I thought it was another banana," Mario said innocently.
Most of them didn't believe him.
"Why...why..." Waluigi was now weeping over the banana peel which was admittedly more rotten looking than before.
Seeing that the situation hadn't improved, Peach said, "Waluigi, how do you know that was your phone? It looks just like any old banana. It could've been any of these."
"NO IT WASN'T! MY BANANA WAS SPECIAL AND NEVER IN A MILLION YEARS COULD I MISTAKE IT FOR SOMETHING ELSE!"
"Where on earth did you even get it?" Wario asked.
"THAT'S CLASSIFIED!"
Just then a toad came in carrying a platter from the kitchen. "Banana splits, anyone?"
While everyone else ate their sundaes phone-call-free, Waluigi sat moping over his banana peel. Finally he moodily took another banana from the table.
"Hey, dad," he moaned into it. "I know you can't hear me but I just wanted to let you know my phone number is changing."
Everyone just ignored him. "I will. Take care, dad." Then Waluigi put the makeshift phone back.
"Now, maybe, our life will get back to normal," Blue Toad said.
"Ha," Yellow Toad laughed. "Not."
At the same time, far, far away, a tall, lanky man sat in his armchair. He held a banana to his ear. "Take care, son."

Hehehehehe...Well, there you go. This idea just came one day...maybe we were eating bananas at the time. Honestly, who doesn't love them a good old banana phone? I think Waluigi was a really good fit, personally...

And no, we have no idea who Waluigi's parents are, they're just for the story. ;)

Thanks for your feedback and please let me know what you think! More coming soon!