I clearly remember the most insane thing I saw a teacher do during my school days. Well, it was more of what she said when we were disrupting her lecture: instead of punishing us, she suddenly got up and threatened to "curse" us! Her exact words were, "I am stronger than the sun, I can even cure cancer, don't make me curse you!"
It still gives me the heebie-jeebies when I think about how she said it. Everyone has had such teachers once, so folks gushed about their "insane teacher memories" that they still remember. Some are funny, while some are simply creepy. Just scroll down and see for yourself!
More info: Reddit
#21
Brought a pistol to school, let the kids shoot rubber bullets in class.
13points
#22
My art teacher paid me cash, in class, for pirating him the latest "uncopyable" 8 bit video games..
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12points