Well, you don't need to be taught by a Catholic nun to have survived abuse from a teacher(s)...
Knuckles wrapped, ears pulled, nose against the chalkboard with gum in between, Sitting on your hands for an hour, getting the ruler across the back of my hand, standing in the corner with a note on your back saying how stupid you are for not paying attention...
It's a wonder that I got an education at all with all of this going on...