Oh, there are a lot. I regret some of them, but, there's one that I don't regret because this guy was always bothering me. He was a bully so yeah. I'm sure that I did something "Right"
This guy lost his father, so I actually said "Your dad killed himself after seeing how an usless piece of shit you are, but don't worry because I'm sure that you're be with him pretty soon. If you don't change that attitude of yours with me."
I can be a nice person, but if I need to do something to put somebody on a corner, I'll do it. Not that I need to be nice with people who wants to hurt me.
Maybe I should say the story behind that. It's too long, so I'll make it short and quick.
I had to deal with physical abuse from that person, so I actually waited for the moment where I could do something. It wouldn't be smart from my end to do that on a crowded classroom, so I had to wait until I had a chance to react.
Not that I want to say that I did the right thing, but it worked, since that person didn't even touched me again. Sometimes, a couple of words are more than enough, not that you need to punch somebody to make them stop.
PS: I guess I need to less open around here.