I had a penchant for them in my mispent youth. As I spent most of my free time either drinking or training to fight from the age of 15, it wasn't that unusual for the two to cross paths. Being 5' 11" and 170 meant the average bar tough guy figured you'd back down or he could take you easily, never realizing you could mop the floor with him, and I tended to encourage that behavior. Much like Vin Diesel in "Knockaround Guys", you get it in your head that after a certain # of fights, you'll be a tough guy. Long before that number, you are one, but can't remember why you wanted to be that in the first place. It wasn't until I was spending the night in jail for the 3rd time while the police were debating charging me with felony assualt (again) that I decided it might be better to not take every opportunity to fight that came my way. I was 25 then, and have had only a couple of minor incidents occur since. As I've seen/been in many, here's a few helpful tips on Bar Fights:
1) Guys who start by smack talking are psyching themselves up to fight, and actually don't want to. You can defuse it by walking away. Continuing the verbal "Oh Yeah's" will invariable lead to someone swinging.
2) If you definitly want to fight, always hit first. Flat of the nose has one of the best effects, as it's the best combination of stunning/bloodying without serious dammage. Ends all fights with guys who don't want to fight immediatly.
3) If the guy looks like he can take you, Groin shots aren't just for girls. Hit here first.
4) If someone has a weapon, hit an open sideways palm to the thorax. You run a risk of seriously dammaging the guy, but people drop everything when they can't breathe.
5) Ok, you want to walk away. Just in case, that loud, semi-drunk guy is always the first who might swing. It's 90% of the time a wide outside right hook. 10% of the time, It's a wide left (as 10% of the population is left handed).
6) Most guys have no clue how to fight, and will swing wildly for 20-30 seconds. They will then be completly gassed, so dodge and cover, and they are basically yours.
7) There's a class of complete idiots who will rapidly take their shirt off first (cause it's muy macho) and then start swinging. Bust them as they are taking it off and you save yourself the 20-30 seconds dodging/covering.
8) Find yourself mouthing off to a guy who isn't saying a word back, but also doesn't seem that concerned? Run, don't walk, to the nearest exit. The most dangerous guys in a bar don't smack talk. They just are debating putting you in the hospital or the morgue.
9) Women love the idea that you would fight to defend them, but actually hate it when you do it for real.
10) If you are not good at fighting, don't get into fights. Remember, Hospital food sucks.