In Grade 5, my regular teacher had had a stroke, and so for at least a month we had a substitute. She took the "let's let the kids learn on their own" approach. This led to a few interesting incidents:
1- We convinced her that the teacher always let us work in the hallway (if we were working on group projects and needed a flat space). Several kids took the opportunity to explore the school without supervision.
2- She never gave instructions for homework. She gave us the sheet of questions we were to do, and she told us to bring it back in the morning. One day, nobody knew how to do the math homework (even I, who was by far the best at math in the class). So we all came in without the homework done (I had a note from my mother excusing me from having to do it cause I didn't get it). Response? The teacher cried.
3- At Halloween, two kids decided that it would be fun to pull a prank on her. With the selective use of blood capsules and fake crying, they convinced her that one kid had beat the crap out of another. She cried after the revelation that it was a joke.
Of course, she was not much worse than the teacher she replaced. The original teacher had a penalty system of "nuages" (clouds). There was a corkboard with everyone's name on it, and five smiley-faces pinned next to them. If you misbehaved seriously enough, one smiley-face got flipped over (the other side was black or grey, as if the smiley was blocked by a cloud). But the penalty didn't actually mean anything. If you had 2-3 clouds, you were not allowed to participate in a prize-for-good-behavior thing at the end of the week. 4-5 clouds meant your parents got called, but even with the bad eggs that rarely happened.
He also took a lot of time every day for Religious celebration (this was a Catholic school, so whatever). But he was really awful about it. He once asked me not to sing the hymns because my singing voice was bad (word to the wise: you want to promote Christianity among kids, don't tell them not to participate because they suck.)
More stories another time. There are plenty. Including some that directly stem from being non-French and non-Catholic (but still Christian) at a French Catholic school.
"I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain."
-Bene Gesserit Litany Against Fear