The human struggle is very fascinating. You learn so much about people by watching people deal with adversity. And there's no greater example of adversity than watching two men trying to dismantle each other with their own bodies, especially mixed martial arts which I find so much more fascinating than boxing or something like that.

Violence is as much an aspect of life as sex or eating or anything else. And it shapes people. I have a friend who is a stand-up comedian. I got him into jiu-jitsu. I gave him a gift of a year of free jiu-jitsu classes. I just said, "Do this, it'll be good for your head."

It's completely transformed his life. He's done it for a year and a half now. And he's really becoming good. He was this nerdy character and this really skinny kid who basically smoked cigarettes and didn't really work out that much. And over the last year and a half, his body's changed. He's got muscles now. He works out all the time. He's much calmer. He's much more secure.