I try not to get into fights. If I had a gun and felt threatened I would pull it out and use it as leverage to end the quarrel, like Ruiner said. If it was a fight I started I'd sure as hell pull it out and finish what I started. I dont go around threatening anybody but if I did and when I have, I've followed up with it. Mainly I just try to stay level-headed and out of situations where one might be needed.

If it is just some drunken antics I'd leave it away and just go mano y mano. I'm a big guy with a huge pain tolerance so I've got a pretty good advantage.