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Izuku was the blessed human being who began it. It was common knowledge that Endeavor was hated as a person, to all his classmates--they didn’t know the extent of Shouto’s family situation, but still, they disliked Endeavor. Extremely.
So, it was one day, in the middle of morning homeroom, that Izuku shot up from his desk and yelled, as loudly as he could, “THE FLOOR IS ENDEAVOR!!”
There was a beat. A single solitary beat.
And then, everyone panicked.
Kirishima leapt onto his freaking desk.
Dark Shadow scooped up Tokoyami and shot the both of them towards the ceiling.
Ashido and Kaminari ran and clung to Bakugou, who blasted them and himself off the ground.
Shouto sent ice beneath him and stood on it.
Uraraka tapped Iida and Tsuyu and sent them into the air, then hopped onto her desk.
Sero shot tape at the ceiling and yanked himself off the ground.
Mineta pulled two balls off his head and leapt at the wall, securing himself there.
Kouda leapt on Shouji, who grabbed onto the locker at the back of the room and lifted them off the ground.
Yaoyorozu made four metal poles, tossed two to Hagakure, and they both used them like crutches and held themselves up off the ground.
Satou joined Shouto on the ice.
Aoyama aimed his laser at the ground and shot himself back-first into the ceiling.
Izuku had been standing on his desk since the start of it all.
Ojiro leapt onto the locker at the back of the room.
Jirou tried leaping out the window; Uraraka reached out and made her float instead.
They stood in their respective spots for a good ten seconds.
And then, they realized Aizawa wasn’t at the front of the classroom anymore, where he’d been giving a lecture up until Izuku’s proclamation.
“Where’s Aizawa-sensei?” Uraraka asked, helping her friends out of the air and deactivating her Quirk.
“Up here.”
They all looked.
Aizawa was hanging from the ceiling by his scarves, looking just as done as usual.
There was a beat. The students all looked at each other.
And then, they all broke into hysterical laughter.
It was common knowledge that, whether or not people were aware of the abuse Endeavor inflicted on his family, Endeavor was a much-hated person.
Not a much-hated hero, really--he did his job well and was efficient as heck--but that didn’t mean they liked him as a person, because they didn’t. Not at all. Most people would agree that, yeah, sure, he was a good hero, but as a person, he was lacking. Big time.
And the U.A. students and teachers--other pro heroes who had worked numerous times with Endeavor in the field and knew just how horrible of a person he really was--were no exception.
And not just Class 1-A.
The entirety of the students.
One day, in the cafeteria, Kaminari leapt up onto the table, cupped his hands around his mouth, and screeched:
“EVERYONE! THE FLOOR IS ENDEAVOR!”
And chaos erupted immediately.
All the students scrambled to find higher ground; Bakugou blasted to the roof again; at another table, Mei Hatsume shot upwards with a jetpack. There were shouts and screams of “OH CRAP!” and “RUN, RUN!” and one of the students yelled, “FREAKING BOOK IT!”
Shouto built this ginormous ice structure that half the students, himself and Izuku included, ran up for safety. Below them, Tokoyami was yelling at Dark Shadow, who was already in the sky, to come down and help him. Dark Shadow shook his head, saying, “No! There’s no time! I ain’t gonna get caught! Sayonara, sucker!” And he saluted.
All Might picked up two tables--one in each hand--and students leapt onto them to escape the floor (All Might himself was also standing on a table, which students were also flocking on top of). Aizawa was on the ceiling (no one actually knew how he got up there). Mineta was helping people stick to walls; Sero was using his tape for the same thing.
It was crazy. Really crazy.
The next day, all the students from the Support Group were wearing jetpacks, because you never knew when the floor was gonna be Endeavor.
And then, Present Mic blasted it on his radio show.
“So today’s weather is looking promising, not a cloud in THE FLOOR IS ENDEAVOR!”
And that was when the rest of the world became acquainted with the saying.
It just escalated from there, and as Present Mic did it more frequently, the rest of the public began to catch on.
Endeavor was walking down the street a couple days after “the floor is Endeavor” went from inside-joke at U.A. to Japan-wide phenomenon. Walking on the same sidewalk towards Endeavor were Izuku and Shouto, each of them carrying a skateboard under one arm. The sidewalk was on a slight slope; Izuku and Shouto were walking uphill, and Endeavor was walking downhill.
Then, from out of nowhere, someone screamed, “THE FLOOR IS ENDEAVOR!”
Izuku and Shouto didn’t miss a beat. They put their skateboards on the ground in front of them, hopped onto them, and the slope carried them backwards down the sidewalk.
And Izuku waved, never once breaking eye-contact with Endeavor.
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Description: So I said “the floor is Endeavor” on the loudspeakers at the shopping mall and.
The video was a solid thirty seconds of people scrambling to find higher ground. Some people hopped on skateboards; this one person pulled a pogo-stick out of nowhere and bounced away on it.
For some reason, people thought that the pogo-sticks were a good idea. It stuck, and pogo-sticks became a suddenly huge thing. And they worked, efficiency-wise; “The Floor is Endeavor” became such a big deal that everyone was saying it all the time, so you never knew when you’d have to get off the ground.
“So tell us, Kamui Woods, how was it out in the field today?”
“It was a challenge,” answered Kamui Woods to the reporter, “but we got through it toge--”
“THE FLOOR IS ENDEAVOR!” someone off to the side screeched.
“Gotta blast!” Kamui said, and he saluted to the camera and launched himself onto the nearest rooftop. The camera tilted; the reporter was running for higher ground, too.
“THE FLOOR IS ENDEAVOR!”
Izuku immediately fired up One For All and smashed a ginormous hole through the floor.
“Okay, we’re back with Kamui Woods, following a more recent villain attack. Kamui, what do you have to comment? Were these villains hard to deal with?”
“Not really,” said Kamui, shrugging. “All I had to say was ‘the floor is Endeavor’ and they all booked it. They ended up scaling the skyscrapers and getting taken down by other heroes we had stationed up there.”
“So you planned all that out beforehand with your companions, huh?”
“Yep. I’ll be honest, though, I was surprised when it actually worked.”
When Endeavor got home that day, the entire floor of the house was covered by a thick layer of ice.
He almost slipped upon entering, actually, just barely managing to catch himself on the doorframe. He straightened up again, scowl on his face.
“SHOUTO!” he hollered into the house. “COME HERE, NOW!”
There was a beat.
And then, Shouto zoomed down the hallway on ice skates. He stopped a few feet in front of Endeavor and frowned.
“What is it?”
“You’re in on this little game, too?” Endeavor growled.
“Maybe I am,” said Shouto, shrugging. “Or maybe I’ve just taken ice skating up as a hobby. Who knows?”
“Shouto, stop this.”
Shouto spun around, did a flawless triple flip, and zoomed back down the hallway from when he’d come.
It wasn’t until later that Endeavor found out Shouto’s siblings were wearing ice skates as well.
Shouto taught Izuku how to ice skate shortly thereafter, and soon they went to school on their blades everyday, with Shouto sending ice on the ground out in front of them as they went.
Whenever they passed Endeavor, they made eye-contact and held it for as long as they possibly could.
Aizawa had permanent hammocks set up at random places around the school, each of which he could get to reasonably quickly. He never knew when one of his crazy students was gonna pull a “the floor’s Endeavor,” and getting to the ceiling every time was tiring, so he just decided hammocks would be a good idea.
Present Mic also frequently used these hammocks, not that Aizawa could really stop him. Cementos, with permission from Nedzu (who actually seemed to encourage it), made several sturdy shelves that students could hop on at short notice. They even attached a monkey bar or two on each wall.
During board meetings for the teachers at U.A., Present Mic screamed “THE FLOOR IS ENDEAVOR!” whenever he was bored. It was all fine, really--Mic had always been a bit of a basketcase, and again, it wasn’t like they could really stop him.
And then All Might started doing it too.
Tsuyu got really, really got at rescuing people--not just from the dreaded “Ende-floor” but from actual villains. She got incredibly good at using her tongue to wrap around multiple people at once and pull them away from danger.
Meanwhile--
“THE FLOOR IS ENDEAVOR!”
“Midoriya, do the thing!” Kaminari exclaimed, rushing towards him.
Izuku grabbed Kaminari and hurled him into the sky.
(Sero caught him with his tape on the way down, of course--as long as Izuku and Sero were together, this was the escape they used. They just had Izuku launch them into the air.)
And then, All Might started doing the same thing, except he was (thankfully) able to catch the people he lobbed into the sky. It would be a very dramatic thing--when someone shouted the dreaded words, he’d grab the people nearest to him and send them into the sky.
“I’LL BE FINE!” he would say. “DON’T WORRY ABOUT ME!”
“ALL MIGHT! NO!” they’d yell back, reaching out to him as they flew into the sky.
“Midoriya Izuku!”
Izuku spun around; a reporter with a mic ran towards him, the camera man right behind her. Izuku turned towards them with a frown, curious.
“What’s up?” he asked.
“Is it true that you were the one who started the ‘the floor is Endeavor’ game?” the reporter inquired, then passed the mic to Izuku.
“Oh, yeah, I am,” said Izuku, beaming. “I wasn’t expecting it to become such a huge thing, heh...funny how that worked out. But everyone seems to be having fun, so that’s good.”
“So tell me, Midoriya,” said the reporter, “is there a specific reason why you started this game? Do you hold a grudge towards Endeavor?”
“Oh, I sure do,” said Izuku, beaming even brighter. “Endeavor abused his family.”
And that was how Endeavor finally got convicted for the abuse he’d put his family through, and his hero license was revoked.
The remaining Todorokis--Shouto, Fuyumi, their two siblings, and their mother--moved in with the Midoriyas.
BONUS:
“THE FLOOR IS ALL MIGHT!”
Everyone face-planted.