Under what circumstances would you beat up a guy?

[captZEEbo]

I was just wondering under what circumstances you guys would beat someone up (assuming that you could and also get away with it, of course). I'm trying to think of some examples that I would do it for, but I can't think of many.

Mine include: raping or sexual abuse of anyone in my family and maybe close friends, someone trying to attack me or steal from me or my friends/family (but not after the fact, just during).

I know a lot of people out there would beat up some guy for cheating on their sister or something, but I would never do that.