I avoid this kind of topic, but tonight is special...
Some guys always feel a need to prove themselves against bouncers/security and really its kind of pathetic.
True.
...A guillotine headlock works really well, like you mentioned, as can getting hold of a wrist or smaller joint (finger) and twisting it the wrong way.
If ever faced with more than one attacker, you always try to do the most damage to one of them. Life isn't like a kung fu flick, where they come at you one at a time and you take each out as they do.
Sho'nuff, been there, done that, it's not fun. I have had my nose bloodied and my ass kicked by a group of four for no good reason... I never started a fight, never backed down from one, but I did finish a few... pace