What is the weirdest thing you have ever seen during a concert?

I'm sure we all like music here to relax and to get our minds off of the struggles of daily life.If you are a music fan and like going to concerts,what are the weirdest things you've seen at concerts?

It could be something that happened to you,people being drunk or the artist being drunk or people fighting,etc.

How did you cope with such things if you were involved in them?

Did you enjoy the concert experience and will you see the artist again?

Personally,I've only witnessed shows where the singer was drunk and a couple of fights in the crowds over the years.

What about you?