obligitory 'not my school' but at this one school there were a bunch of teachers who all got fired when they were teaching the same class:

• one of them got in an accident and had a pretty bad case of amnesia, to the point where he definitely wasn't able to teach the class
• another one was a total bitch but because of interference from the government, she was promoted to principal but then she turned out to be super racist and actually got into a fight. government kind of backed down a bit after that and she was gone.
• another one WASNT EVEN WHO HE SAID HE WAS. had basically stolen this guy's identity and was masquerading as a teacher. think jack black in School of Rock but the dude was a criminal
• one guy was murdered
• there was one guy who seemed totally fine but then it turned out he was hanging out with this wanted criminal guy? and he had some kind of weird split identity condition also. like i dunno once every so often he would just act completely differently. he wasnt fired he actually quit cause he figured the parents of students would want him fired when it started getting out.
• oh yeah and another one literally had voldemort hidden under his turban :/