Sounds like you went to a pretty messed up school...
Anyway, my old school wasn't too bad, but one teacher did have a rumour following her around for years that she'd been fired from her previous school for seducing a Sixth Form pupil there. It was never confirmed or denied though. Another teacher, who was only a substitute while the permanant teacher was on maternity leave, was also rumoured to be a paedophile. Another one who took up the same role was just really nasty, but he had his comeuppance when a whiteboard fell off the wall and onto his head

.
Oh, and another substitute who plagued my Maths classes in Sixth Form didn't bother teaching us anything. He thought he could teach us about vectors and mechanics by throwing a pen around the room to simulate parabolic motion. Still, he was better than the permanant teacher, who never taught ANYTHING at all. One Physics teacher was driven out of the class by some unruly pupils in my class in Sixth Form, and apparently had a minor breakdown before coming back to finish the lesson. I apparently threatened my first PE teacher with a hockey stick in Year 8, though I don't actually recall it happening myself, my friends won't let me forget it. Admittedly no-one liked that teacher very much. Another teacher, who we all loved, taught History and once when describing some battle or something got a bit too animated and excited and kicked my desk halfway across the room. On a residential school trip to Wales another former teacher described how he and his wife were driving along a particular place that we passed and found a dead pheasant, that they subsequently picked up and took home to cook and eat (the guy was cool, though

). And I got kicked out of a class in Year 8 for half the lesson because I was laughing too much at a joke someone had made when talking to the teacher...
Actually, maybe my school WAS pretty bad for these. Even though it was a grammar school, too...