Some of you seem you are/were very inconsiderate and rude.
However, yes, but only once with a good reason. My teacher was a total homophobe and basically bullied my friend for being gay. She mainly did it in subtle ways, like finding any tiny reason to flip out on him. Not only that, she seriously got MAD sometimes when people asked for help on something or just asked a question. I was starting to get mad, and one day she gave my friend a 0 just for trying to explain a question to someone, after she refused to help that person out. It was during a quiz, so she took it as ''cheating'', even though she was RIGHT THERE and heard the whole thing.
So the next day my friend and I decided to let her know how we felt about what she did, and I told her to reevaluate her life and start being a proper teacher. She sent the two of us to the principal but the principal was on our side after telling him what happened. He told her that it was the last straw and if he got one more complaint about her (he already had previous ones), she would be fired. He also asked to see the quiz my friend took and changed his grade to the proper grade he should have gotten.