"Weird" is in the eye of the beholder. A lot of the time, the "weird kid in school" is simply a non-conformist or someone who doesn't make friends until college, but some behaviors are objectively weird, like arson. Or playing with poop. Or worshipping Hitler.
A Reddit thread asked, "What did the 'weird kid' at your school do to be called the 'weird kid'?"
Here are the weirdest answers.
Play with gasoline and matches and burned his eyebrows off.-uhyasure
He carried around a massive tub of Vaseline all the time. Like, not a little 5 oz thing, but something that you would get in bulk at Costco that took up his entire backpack.-MadameBurner
Sniffed people and growled like a dog. Generally acted like a dog and such. This was about when furries became a thing so, hindsight 20/20 definitely a furry.-everythymewetouch