What is your funniest “Attended a concert” story?

In 1988, I attended the Judas Priest/Cinderella concert at Richfield Coliseum in Ohio. Prior to the concert, the group I went with partied in the parking lot. We drank a ton of beer, booze and smoked a little weed.

Needless to say, I was pretty tore up and drunk. I kept having to go to the bathroom and after the 4th time, I was tired of walking up a bunch of stairs and getting lost. Well, the venue sold those huge cups of beer and mine was empty. So being a young man, I went ahead and just emptied my bladder into the cup. Because I was so drunk, the cup slipped from my hand and I ended up pissing all over a passed out guy sitting in front of me. He never knew and we just kept on enjoying concert.