I've never been in a fight, although there are people I've dreamed about fighting with. I don't think I'd ever start one, but you never know. I know myself well enough to know that it's not impossible to be driven to the breaking point of attacking someone whose making me mad. It'd probably be a girl fight, though.
I'd of course fight for self-defense/if another person started it. I don't know how good I'd be, but I'd at least try.
I wouldn't mind getting in one fight over the course of my life just for the experience.