I'm not sure if I count, but in college I stood in for a programming teacher for one of his freshman class. I was talking about basic data structures when I noticed this one kid at the back had his headphones on staring intensely at his monitor. I walk over to the teacher's pc from which I could monitor what each student was doing on his pc.
Dear lord, I was not prepared for what was about to come next. The kid was watching some pretty intense bestiality videos. I'm talking around 3 or 4 tabs of dog/horse shit. Took screenshots of it and showed it to the professor. Never saw the kid again.
I'm not a teacher or professor, but a college student, and last semester there was a girl who would pull her hair every day in class and just randomly laugh or yell at nothing. All of us students would look at each other, including the professor.
At one point in the semester, we were working in groups and so we had to move, and she haooened to sit in my normal seat. As I was getting up to meet up with my group, she walked up to me and said "you better move now. I'm having a bad day." Being that was already standing midway, it was kinda freaky because of how she had acted previously in class, and I said something like "yep, you got it." I think she may have had some mental issues.
I used to have a piano student who wouldn’t say a word to me, just angrily stare. The whole family was really oddly quiet. Mum, son (pupil) and younger brother.
One day I met the father. He was SO friendly and warm I couldn’t believe it.
One of my students gave a presentation on Plato. None of what he said came out of the text we had read, and the rest of the class noticed it. We asked for his references, and he said "I know Plato." Me: "So you studied Plato in another course?" "No, I talked to him, and I'm telling you what he told me." A few days later he was banned from campus for selling drugs. Apparently he didn't take the standard advice not to consume his own supply.
I know a guy like this. He tends to ask deep philosophical questions to unsuspecting strangers while he is high on cocaine. It can be pretty funny at times, but if you don't know him it comes off as creepy.
I had a student who said they were going to be absent because they “had to get rid of a ouija board.” This was just one of the many weird things they said to me that semester.
I had a kid who was damned near catatonic because of his meds. It was so off putting and sad, because he was so funny off of them, but on them he just sat there, never blinking, occasionally drooling. His parents insisted he had adhd, and they were the bosses. :/
Justin was the "cool' kid. An overprivileged dude that had everything handed to him his whole life. He had the mental capacity of a teenager as a senior in college. He was taking my 100 course and could not stop from making rude and disgusting comments, which made everyone in the class feel uncomfortable.
When I confronted him and told him it had to stop, the next day he bought me a gift. I refused it immediately knowing he was literally trying to buy his way out of the shithole he created. He became angry realizing that he could not buy me and further disrupted every class whenever his grace decided to show up.
He failed that course. Took it with another professor who somehow passed him - or accepted his gifts. Then the following semester Justin showed up in my 101 class. WTF was he thinking. Any smart person would run away from a professor who just flunked him.
And yes, Justing flunked 101 as well. The only student in my career that earned an F in two courses I taught.
Years ago a kid in my gym class carried around an old book in Latin and would poke people with crystals to "steal their souls." He would hiss if I passed him because I wear a cross.
I was teacher for many years but worst by far was a kid I went to school with. Total neckbeard, nasty ass teeth, sucked in every class except German which he magically became fluent at...fast forward five years later and catch him at a smoke sesh. he talks about working as a dishwasher at ihop and banging some girl that works there for months before realizing she's a prostitute on the side that gets paid in meth and heroin lol. Also he never learned how to drive a car and legit thought anarchy was the best system of government.
As a grad student I gave a guest lecture for the professor I was TAing for. It was a large 300 person lecture class. At the end of the lecture, a student who sat in the front row dressed in a suit, tie, and briefcase came up to me and wanted to give me "critiques" on my lecture. His critiques were fairly generic and I thanked him. This was a section of the class I wasn't the grad TA for so I asked her later about him and she told me he dressed like that for class every day.
In my section of the course, we had a girl have a full blown screaming meltdown when she approached the professor about her exam grade. She was huffing and puffing, pulling at her hair, and screeching. Her grade wasn't even that bad (a little below the class average). I noticed her often talking to herself so I think there was some mental illness going on.
In my class currently. I teach severe Special Education. This kid is B-A-D, bad and has major psychotic issues. Kid is a straight up sociopath and will one day be on the news for killing somebody; mark my words. While he hasn't done anything particularly creepy in class yet this year, his past includes being sent to a facility for slamming a bunny into ground and killing it.
I once had a student who started a club called “I’m going to kill (my name)”. It had an oath and a plan and everything laid out in explicit detail, complete with graphic drawings of me laying on the floor of the classroom with a knife sticking out of my chest and him standing over me. Thankfully, he was the only member of said club. It was not a fun time.