Wanda walked into the communal lounge, where Peter was surrounded by an explosion of christmas, five pieces of tape stuck to his cheek and paper all over the floor. 

"What's going on in here?" She asked, curious. 

"Decorating." Peter replied shortly, obviously concentrating. 

Wanda nodded, pouring herself a glass of water and sipping it. "Are you decorating the tower then?" 

Peter nodded, unfolding a large paper snowflake. 

Not giving it much thought, Wanda left, heading back to where she had been watching Mean Girls in her bedroom. 

Once Wanda was gone, Peter pulled on his Spider-Man suit, activating his heater to stop him from dying of frostbite from the cold snow outside the tower. He also wrapped a scarf around his neck, just for aesthetic. 

He gathered all the Christmas lights and walked out onto the landing pad, which was covered in a layer of snow. Sometimes, just to be funny, they would sweep it down off the side of the tower and laugh when it landed on pedestrians below. Yes, they were those sorts of people. 

He placed the reindeers, snow men and santa light decorations made for suburban houses on the balcony among the snow and turned them on. Smiling at his work, Peter gathered his many long christmas lights and walked up the wall to the top of the tower, waving at Steve when he passed him (laughing when he had a heart attack and fell off his chair) and stopped when he reached the very very top. 

Peter refused to look down, though he had grown accustomed to the heights of skyscrapers and buildings. 

He taped the christmas lights to the very top with a very strong duct tape, knowing how strong winds could get. He then began slowly wrapping the lights around the tower, glad he had bought the biggest you could possibly get in the world plus extra to make it look like one big one. Being the son of a billionaire definitely had its perks. 

Landing on the landing pad again, Peter grinned up at his handiwork, watching the lights flash merrily against the grey skies, flecked with the white of falling snow. 

"Now for inside," Peter decided, walking back inside where he found all the Avengers looking rather pale, some of them out of breath like they had just run there. 

"What happened?" Peter asked obliviously. "Is there a mission?" 

"Why," Steve panted, one hand shaking and the other running through his hair. "Why were you climbing on the tower?" 

"Oh," Peter shrunk slightly under everyone's glares. "I was decorating the tower." 

Tony sighed angrily, tugging on his hair. "Peter. How many times have I told you, don't give mum a heart attack. He's a hundred f*cking-"

"Language."

"-years old, and we still need him to help with missions and get you off the ceiling when you get stuck." 

"Sorry..." Peter mumbled. "I just wanted to get everyone in the christmas spirit, it's the best time of the year." 

"Alright, but no more of the outside of the tower unless it's the bottom of the tower, okay?" 

Peter nodded, twisting his fingers. "Should I go take it off then?" 

"No, we'll leave it for now." 

Peter's shoulders sagged in relief, and the Avengers went back to what they had been doing before the false alarm, though only after checking that Peter was okay. Steve held him in a  hug for a long time, then started on dinner. 

Peter then started on decorating the inside of the tower, wrapping tinsel around the bannisters, hanging paper chains and snowflakes from the ceiling, and his favourite part... hiding creepy elf dolls in random places for people to find, which was an entertainment in itself. He had Friday send him the videos of everyone's reaction, and uploaded it to youtube as both a remix of different screaming, titled; Santa's always watching, and a video of him doing the prank. 

The remix began with a panning camera, stopping on the creepy elf doll, with Santa Claus is coming to town in the background, but slowed down and slightly static in places. Then it had all the reactions of the people when they saw the elf, some jumping, one even screaming, a couple swearing and clutching their chests, Natasha smashing the elf to pieces with a baseball bat. 

The normal video began with Peter (as Spider-Man) holding up the many identical creepy elf dolls, explaining what he was about to do. Then there was footage of Peter putting the elves up and doing thumbs up at the camera. 

The last of the video was people getting scared when they found the elf in random places, a couple even screaming, then a time lapse of Peter conducting surgery on the elf then placing it near where Clint would find it. He did a thumbs up at the camera, then hid. 

Clint found it relatively quickly, for Peter was hiding, remote controlling it to move ever so slightly every few seconds when Clint wasn't looking. 

He waited until Clint got close, nose to nose, about to grab it then made the elf jerk suddenly. 

Clint made a shriek that sounded like a pig after being trod on, stumbling backwards and landing on the glass coffee table, shattering beneath him. 

He continued to hyperventilate as he shuffled backwards across the floor, throwing Peter's chemistry books at it, which made it's neck spark and one of the eyes to pop out. It still continued moving towards him however, making it even more creepy. 

Clint shrieked even more and pulled a baseball bat out from beneath the couch (how long had that been there?) and started bashing the elf to pieces. He stopped once it stopped moving, panting, only for the elf to twitch it's finger. 

Clint bashed the elf another ten times, then stopped again, waiting for it to move. It didn't, so he backed away, swinging the bat in one hand, panting. 

"What is going on in here?!" Pepper yelled, stopping in the doorway. 

"The elf was moving!" Clint told her, pointing to the smashed elf beneath him. 

"Don't be silly Clint, it's just a christmas decoration. It was probably going to sing you a christmas carol or something. Now clean this all up, we were meant to have guests tonight." 

Clint mumbled something under his breath but began to clean up anyway, which concluded the video. 

Peter, who had been using security footage as a way to know what to do while he controlled the robot, had been cracking up laughing the entire time. 

The internet, quite obviously, loved the videos. Clint became the latest meme, a picture of him smashing the bot used countless times, sometimes with the caption; 'when your best friend tells you they don't like the Avengers' above it. 

Clint was torn between loving being the centre of attention and being mad at Peter.

He chose both. 

A video was uploaded to Clint's instagram not much later, consisting of shaky phone footage of Clint showing the camera a bug spray can with 'f*ck off bugs' written on it. Then he snuck up on Spider-Man and sprayed it in his face. 

"What the hell man?!" Spider-Man had yelled, coughing and sneezing. After that, there was a video of Clint's face when he turned the camera around. "Mr Stark I don't feel so good," 

"Sh*t guys he's actually sick," he told the camera. "God dammit Nat's gonna kill me."

"CLINT!" A voice yelled in the background. The video ended, and the internet blew up within a few hours. 

Spider-Man went to instagram not long later, with short clips of him cooking hundreds of dishes with birdseed mixed into them, then packaging or serving them up and giving them to Clint. 

There was a clip of Clint eating lasagne, then spitting it out when he found a layer of birdseed beneath the pastry. 

There was then a clip of Clint eating a sandwich, then spitting it out when he found another layer of birdseed beneath the bread. 

After that was a clip of Clint cautiously checking his burger during a dinner, then sighing in relief when there wasn't any birdseed and biting into it. He immediately spit it out, washing his mouth out and pulling a couple of feathers out of the bottom slice of bread. 

The last clip was Clint taking a large mouthful of ice cream then spitting it out upon finding birdseed in the middle. 

"That's it Spidey, I'm going to effing kill you I'm not even kidding-" the video ended on that, and with that, the prank war had begun. 

Nobody was safe. The last time this had happened, Peter had had to camp out in the kitchen, beneath the sink for a whole week. He missed a lot of school, and it was only over when Pepper walked into the room with a gun and shot it at the ceiling. 

"Snap out of it all of you! There is work to be done! Stop this stupid-" Pepper cut herself off with a loud gasp, a bucket of green slime emptied upon her head. 

Everyone went wide eyed, faces turning whiter than a sheet. 

"Sam, Sam you'd better run. I'll distract her." Peter dropped to his knees as Sam bolted from the room, clasping his hands in front of her. "Please don't kill me Auntie Pepper, please, I don't wanna go, I don't wanna go..." 

Tony crashed into the room, face red with anger. "You little- ship. You know- you effing know that movie traumatised me- don't you effing dare say that you-" Tony cut himself off with a growl, clenching his fists, then helped Pepper clean herself off, reassuring her that Sam would never see the light of day again. 

And so prank wars were banned in the tower, but everyone knew they could never really be banned, not when Peter and Clint were involved. 

That's why nobody was safe. 

The girls just left for one of the empty guest floors, filling it with food and instructing friday not to let any of the others in until the prank war was over. They had a great time, painting nails, washing hair, doing makeup, watching girly movies none of the boys liked and frankly they didn't like either, and overall, just having a girly time. 

Meanwhile, upstairs was a war zone, literally. 

"Dad I'm dying, please it hurts- the light is fading- I don't feel so good- I don't wanna go, please, I don't wanna go-"

"Peter it's an effing paintball get up we can't lose this." 

"It hit my internal organs I am not okay!" 

"Peter get up- you lifted an effing building off you, you can deal with a damn paintball." 

To think, Clint thought, aiming his paintball at Tony's genital area from the vents above, that this all began with christmas decorating the tower. 

Clint never saw the light of day again. Nobody knew what had happened to him, it was just like that time Sam disappeared off the face of the earth. Tony had promised Natasha and Laura that he would find him, but unfortunately had found no traces, at all. 

Perhaps prank wars were banned for a reason.