Some folks don't appreciate getting hit over the head. A very close friend of mine was dancing with a girl in a night club several years ago. The girls boyfriend came over and told him, "You don't know who I am, that's my girl." My friend smacked him with a beer bottle and kept dancing with the girl. Later that night he was shot to death by 3 guys while he was trying to get in his car and leave.
Listen kiddies if you wanna hang out in bars and clubs, where the underworld thrives, you better turn the other cheek and say I'm cool, or have an army with you and a bullet proof vest.
I limit my public drinking to restaurants now a days...