Had a few grim 'uns in my school.
Kid called Aeron who was just standardly weird. His older sister was a top slag who then ballooned to about 20 odd stone in sixth form. Always used to try it on with girls, pulling their hair, stealing their shit (when he was about 16/17) that sort of thing. Tried to convince us that he and his dad (in a wheelchair) were gardening at the weekend and dug up a fully functioning and armed World War II era tank. Top mong.
My mate James was a sound kid, but when he got angry, he got seriously angry. We were on a trip to a cottage in North Wales in year 9 with some other school (pretty inner city compared to ours, had a bad reputation, etc. but for the most part they were pretty sound) and some kid from the other school was winding him up. He just completely flipped, stormed out the room, me and a mate ran after him, found him in his dorm taking his shoelaces out of his boots. We watched as he formed a belt with a little loop to hold a sword in, ran down to the pool table, grabbed a cue, snapped it in half and put it in the little loop, ran into a cupboard and grabbed something. Then, runs up to the kid, screaming, tears running down his cheeks, smacks this kid across the back then stabbed him in the hand with a screwdriver. Used to claim variously that his dad/uncle/grandad owned the Arrows Formula 1 team.
There was a kid that was on Jeremy Kyle the other day (the 2nd one from my year at school to be on there). Anyway, he was in our technology class, he used to sit on our table, his name was Chris Christodoulou (in case he needed to be any weirder) and he'd been away for a few weeks. We come back and ask him where he'd been. His story was thus: He'd been having some problems with his next door neighbours. So anyway, he's sat at home with his mom, and his next door neighbours break into the house THROUGH THE WALL, hit him with a brick, then raped his mom in front of him. Obviously, I called him out on his bullshit, and he just looks at me, stone cold and says "I will break your spine".
Grimmest story was when I was in sixth form though (it was inside the school). I was in year 13, so approaching 18, and this kid in the year below runs into the common room one break with a story about this pretty trampy girl in his year. Basically, she'd been caught by the vice principal in the grimmest toilets in the school (more on them later) giving this year 8 kid (so what, 12/13?) a blowjob for cigarettes. Obviously sounded like he was chatting shit, so we ran up to the VPs office, and she was sat in there looking embarassed as fuck. She didn't come back to school, and this kid went round for ages bragging that he got a BJ of a sixth former and didn't even give her the cigarettes
Those toilets, we walked in one break time, mate walks into a cubicle, we hear him heave, he tells us to have a look in, we look in there, there's a pair of pants just saturated in shit, shit all over the floor, all over the walls of the cubicle, and on the window and ceiling of the toilet (we're talking a good 8 foot high), just shit everywhere. I can't fathom what must have happened to this day.
Saying that, that's just reminded me of another one. We had a friend called Matt who was just your standard normal kid, then he got this girlfriend, started wearing make up to school (butterflies painted by his eyes and shit), and carrying this little red book with him everywhere. Anyway, he alienated himself from everyone, and in sixth form one day, I walk into the toilets and he's got his dick and balls out just washing them in the sink. Then this story emerges (from him) that he was going out with this 15 year old (think he was 18 at the time, so already a bit dodge) and he's round her house. Her mom doesn't want them alone in her room, so the girl goes to get her mom a drink, which he spikes with, and I quote, 1 and a half E's. Anyway, he manages to get her to her room, where he gives her a load of ketamine then fucks her. Last time I saw him, was walking through Birmingham City Centre on my way home from work, he's sat there on a bench with a bust lip, eating a packed lunch (still got his little red book with him). Ask him how he bust his lip, said he went to some club that had a rap battle open mic night and he started reading his own poetry and got beat up. That was the last time I saw him, but my mate saw him a few months ago and gave him a lift home, said he had a fat beard and stank of booze, and could hardly string a sentence together. Shame, this kid was an athletic hero, next level fast, one of the top sprinters in his age group in the midlands, and then he completely changed, absolutely unrecognisable.