Let's see - bad sound production, performers who are hammered or just stand there, security, walking in puke, people slamming into you, the whistlers, the fights, people getting hauled out by cops or on stretchers, pretty much the whole scene. I've been to some bloody ones back in the 70's and 80's. The last one I went to was Ozzy doing the Crazy Train tour at Maple Leaf Gardens in Toronto in 1981. I went to the can and there was blood all over the walls and a sink smashed off the wall clearly by the guy's head who was laying there unconscious and cut up real bad. I decided then and there I was done with live shows but at least I got to see Randy Rhodes. I remember 11 people died at a show by The Who in Cincinnati in 1979 - trampled to death. Just not worth it .