He was fascinating to watch simple because he has absolutely no chin! None at all! That's amazing!
I've seen that several times, Michael. There are a few genetic issues that can cause that, but I'd be willing to bet very good money he had a really nasty trauma to his lower jaw as a young child. That can stop growth entirely either on both sides (in this case) or just on one side.
Obviously that never happened to Jay Leno!
Cool technique. I'd love to see what it feels like.