Moshing

http://www.youtube.com/watch?v=pFqWc718JZs

http://www.youtube.com/watch?v=Z_c5xwKIWs4

"How was the gig?" she asked as she arrived in the office.
"Fantastic" I said "But I'm a bit bruised this morning. I surprised myself by going down the front and getting involved in all that business."
"You mean moshing", she said
"I don't think so" said I.
A few seconds later
"What exactly is moshing?"
"It's where everyone jumps into each other..." she said
"Oh...yes...that's what it was." I replied. " I don't think it was called that in my day - I always thought moshing was something else."

Footnote: This is what wikipedia says on the subject.
http://en.wikipedia.org/wiki/Mosh