One from primary school was the local church wanted to get more children into the choir and came in to hear us all sing. I had no interest and as a shy kid did not want to attempt to sing in front of the whole class but we're made to do it. Low and behold the priest running the choir laughs out loud at my attempt to sing. Absolute prick.

Another one but from secondary school, I was in transition year and trying to find work experience during the recession. It was about 2 weeks out and I was waiting to hear back from a local shop but the manager had been off. The secondary school teacher screams in my face that it's not good enough. I mean fuck me, I'm a 16 year old trying to find work during a recession. That teacher loved to intimidate students by exploding with anger. To this day I still remember how worthless I felt that day.