My seventh grade history teacher. She was strict and she made it difficult to remember anything because she was very critical. Example: If a student said... that was the Battle of Freeman's Farm (and the answer was wrong)... She'd say something like... well, someone has no gears moving in their noggin... or something like "only a retard would say that"
High school physics. Told us we were all idiots and not to go to university because we would all fail.
My high school government teacher told us that a president had never won the election but lost the popular vote. I switched to another class.
Ms. Hall the dumb **** called my house, christmas eve, to tell my parents that I failed a quiz. She lost all the quiz papers so she gave everybody 100s except me because she told my parents about some fictitious quiz that I never took in the first place.