As someone who works in a pub, I'm no stranger to drunks, although we're lucky they rarely cause trouble.
We've had to bar various people for being anti-social, and sometimes you get the goon that stares vacantly whilst failing to take in he can't buy pork scratchings 15mins after we've cashed up...
Only time there's been trouble whilst I was in it was actually the sober but deranged estranged wife of one of the custommers! she just walked in, screamed abuse at him and his new bit of skirt and then started smashing their glasses accross the table. The regulars were very good though - several of them stepped up to help escort them to the door and keep them there till the fuzz turned up, so there are still plenty of good guys out there...