Went to Portishead's first gig in Bristol for years last year, and place was rammed, everyone kinda stood there in awe or whatever, but there was one hugely drunken twat who insisted on singing along. Badly. Every single person around him told him to shut the fuck up at one point or another, and he did for a bit, then forgot and started again. Thing was, place was so rammed that you couldn't move away from him.
Grrrr.