I went to a public school in North County Dublin; I have one of these stories for pretty much every single day of the 6 years I spent there =P
That place would be the perfect setting for a sitcom about crazy/dumb teachers.
- On graduation night, it's tradition for all the graduating final year students to go out to a nightclub with the teaching staff. It's generally pretty hilarious and a lot of stories come out of it (you'll be hard-pressed to find any Irish person who pays into a bar and doesn't come out blind drunk). But on one occasion, a particular teacher shagged one of his students. Now this probably occasionally happens, but rather than be discrete about it, the genius actually went around bragging to the other teachers. He actually believed that it was perfectly fine because "technically she wasn't my student anymore." The funniest part was that he thought this act was something brag-worthy, rather than something that paints him as a desperate, closeted paedophile who jumps at the first possible opportunity to jump his students.
- Another classic was this legendarily insane woodworking teacher. He was this big, thick, dumb, lower-class Dubliner type who also coached the rugby team. He was renowned for blowing up at troublemakers and actually throwing shit at them or physically intimidating them. Ironically, he was fairly well-respected for being a Tough Crazy Bastard Who You Shouldn't Mess With. There are a hundred stories about him, but the most memorable one was how he lost his coaching job. During a friendly rugby match between our school and another inner-city one which were known to be dirty players, one of the inner-city kids made an illegal tackle (or something like that, I never understood rugby). Rather than appeal to the referee, this guy sprinted out onto the field and punched the kid in the stomach, resulting in a small riot. Which, in our school, is revered as a quasi-heroic act.
- There was also an unfortunate teacher which my class had for Irish, who we drove to a nervous breakdown. She'd spent 20 years teaching kids in the country (who she claimed were far more respectful to the Irish language than us Dubliner brats) had absolutely no idea how to control the class. The reason it got so bad wasn't because we were a bad class (we were probably the most well-behaved in our year), but because the second control started to slip away from her she'd use increasingly draconian punishments. It started with forcing us to write entire chapters word-for-word for minor offences like talking in class, and got worse. Maybe country folk accepted that kind of stuff, but it created an intense atmosphere of rebellion in her class.
One time, we were doing a test, and afterwards she told us all to put them in a neat pile on her desk. But as more and more people put their papers on her desk, the pile got less and less "neat", which evidently drove her insane. She grabbed up all the test papers, and with seething fury crumpled them all into a giant paper ball and stuffed them into her trash bin, then demanded fiercely that we "rummage through her bin, find our paper, and put it back on her desk in a neat pile this time". Naturally, we all said "fuck that" and tried to leave, at which point she ran to the door, physically blocked our exit, and told us that if we tried to leave she would give us zero marks and we would fail her class.
This resulted in a massive shitstorm during which she took a "voluntary leave of absence" for like a month. A lot of parents wanted to see her fired for incompetence but it just doesn't work like that.
I have like 12 more teachers to mention but this post has taken too long to write anyway...