Concerts are meant to get out of hand. When I think about the phrase "rock show," the first thing that comes to mind is a stream of cops flooding the Rage Against the Machine concert during the last song when Zach de la Rocha screamed "F@#% YOU, I WON'T DO WHAT YOU TELL ME!"
These events can quickly become unruly, but they don't often get as disgusting as an ex-cop from Massachusetts urinating on a Metallica fan.
Apparently Joseph Houston was so intoxicated at a January Metallica concert in Boston that he urinated on the concert patron in-front of him. Houston decided that rather than miss a lick of "All Nightmare Long," the better choice would be to use another Metallica fan as his own private urinal.
I've certainly witnessed my fair share of drug-related, violent, and even sexual acts at concerts, but this might take the cake on the intensity scale. Have a classic concert moment that you think could compete? Fire away in the comments!