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We had a metalwork teacher who was going to go to the head after a class about one of my classmates. Then made the mistake of going into the store room to tidy up. 5 mins later and the kid in question had managed to tack the door shut and refused to crack the door until he promised not to see the head. Funny at the time but in hindsight the poor bastard was quite broken when we finally got Mark to let him out.
This was the same class where one of the less bright kids thought a paper towel would work fine to pick up the angle he’d just brazed. Off to hospital for you lad.
We had a music teacher of a sensitive disposition who left after having a bit of a breakdown when the class locked him in the instrument cupboard and set off fire extinguishers in the classroom.