"My brother is a high school teacher and he once texted me that he caught a kid cutting his pubic hair in class.
Another kid (not even from his class) randomly ran into the classroom, took some binders out of a bookcase and started jumping up and down on them. Then he ran out of the classroom again."
Cressonette
In elementary school, there was a kid who was picked on a lot. In class, if someone gave him a hard time he would stand and yell out every cuss word he knew.
It was, of course, for shock value and no one understood he needed help, not to be ridiculed. We were about 8 years old and that still troubles me all these years later.