I've played in a few bands in my time, and I've seen some of the craziest behaviour in bars when people deliberately go out to get hammered, and attempt to have a good time..  Fights between men, free-for-alls - and the occasional fights between women as well.  Alcohol when consumed solely to get drunk, is like a blasting cap on dynamite.  It may or may not go off - but if it does, there's going to be damage. It doesn't take much of a spark to set it off.