I can generally "get through" pain. I don't know about a threshold as, really, I can't compare myself to other people as I don't know if they experience it differently or anything. The worst pain I've experienced would probably be testicular torsion. I've been run over before which involved the muscle and bones being literally ground/ripped away from my leg under a tyre, and I've been punched in the balls, too. But neither are on par with testicular torsion, which at it's extremes is just... urgh. So bad.

I tend to just get rather introverted and focused when experiencing pain. And, naturally, a little bit aggressive. I do not enjoy pain on any level.

EDIT: You never knew other people get leg cramps? xD Do you mean you genuinely thought you were the only one? Hahaha. Oh Zeldy. *hug* Yes, I've had leg cramps, too. Toe cramp is worse - you know, when your toe looks like it's been disconnected? Or maybe my toes genuinely do disconnect. =| Hmm. I wonder. Either way, it sort of flicks up and stays stiffened there (that wasn't supposed to sound dirty >_>; eh heh) and causes mucho pain. You can't walk until it finally relaxes. That's probably in the top five pain experiences I can think of, actually.