2nd year RE class and we all sat down and there was already paper on each desk so Colin drew a rudimentary penis on our bit and the teacher strolling past clocked it. Now this guy was American, in his 50s and built like the side of a house, he dragged poor Colin out of his seat while calling him a little mother f*cker then kinda pushed/carried him across the classroom and threw him against a wall all the time calling him all sorts of shit. When Colin bounced off the wall the teacher pinned him against it and held his fist up to hit him before thinking better of it and just going back to verbally abusing him. He then turned away from Colin and started shouting at all of us and calling the head of year and his wife who was also a teacher "f*uckers" and "Mother f*uckers" and saying he didn't care if us little b*stards told them and reported him for what he was doing. The whole time he was at 99, red face, raging, the whole nine yards, we all sat slack jawed while Colin stood by the door where the teacher left him. It went on for a while just him ranting and swearing then he started to come down and calm a bit. Colin was asked to retake his seat which he did and the teacher apologised to us all for his outburst then once he'd gathered himself the class began.
Nobody reported it or anything and Colin just laughed about it (he wasn't the sharpest tool in the box) and life went on.
Secondry state education in Scotland in the 80s ladies and gents.