I haven't made a teacher cry but our biology teacher had severe asthma, one day a group of the troublemakers who all sat at the back of the class in their little clique started spraying deodorant everywhere. She asked them to stop but they just carried on, in the end a few pupils had to help her out of the class while she breathed into a paper bag!
Another time myself and a few friends were messing around pushing a lamppost back and forth, it was quite wobbly and probably could have collapsed at any moment which for some reason is hilarious to 15 year olds. Our French teacher saw us through his classroom window, ran down three flights of stairs, slipped on a grass embankment and broke his arm! I feel quite bad as he was a really nice bloke.
We didn't have the best secondary school though, one of the science teachers used to ask all the girls to sit in the front row so he could perv on them and the design & technology teacher used to grope some of the students!