Kid went crazy because he had to do a computing lesson. So he casually destroyed every computer in the school, and threw one at a girl who was around at the time. He would've been 11 at the time.

This might get buried, but last week a student in my special Ed class threw an apple very hard directly at one of our paraprofessional's head. The apple hit her hard and I immediately called my vice principal. When the vice principal arrived ahe asked "well you didn't mean to hit her right?" To which he replied "that's exactly where I was aiming, it was a good throw." I guess last year he took a razor blade and cut a classmates leg open with it. He was sent to an alternative school for 2 months and he ended up back at my school. Kid scares the s**t out of me.

Oh dear, where to begin? Here's one that comes to mind...

Kindergarten girl had a pair of scissors. I turned just in time to see her reach over and try to cut off another girl's ponytail. Not a major thing (because no cutting actually happened), but when I asked her why she was going to do that (because they normally got along very well) she said (in a simple, very straight-forward tone of voice), "because her hair is what she loves the most."

Sent chills up my spine.

I'm not sure whether this is your standard of psychopath, but once I saw a 5 year old boy cycling round and around his mum on a tricycle. He was pointing and laughing at her. His mum was sitting in the middle of the floor, crying her eyes out, and biting herself, which I later discovered was self harming.

Little s**t for brains had wound his mum up to a point where she was crying, and then taunted her for self harming.

My wife is a teacher. About 10 years ago, a student took apart a pencil sharpener and removed the razor blade, cut a groove in the back of a pencil, slid the razor in to it, used rubber bands to secure it, and tried to slice her with it.

Well, my grandparents got married at her daughters home (both were widowed) and right when they asked that question, the phone rang (this was the late 80s)
To his credit, the rabbi said “even in this modern age, we simply cannot accept objections via telephone” and went on with the wedding!

Threatening someone “as a joke.”

People think if they say “lol” or “I didn’t mean it,” it magically stops being serious. But if the threat is specific enough, believable enough, or causes someone to reasonably fear harm, the law may not care that you were “just mad” or “just trolling.”

Riding in the back of a pickup truck.