Because I have a glass jaw. I have a big head, like I needed to tell you lot,and probably a tiny brain that bounces around like a pea in a bucket. When I was best man at my mates wedding the suit hire assistant said" it appears we do not have a top hat to fit you in store, we will have to order one in sir, you have a different sized head." consequently in the couple of stupid fights I have gotten into as an adult, it has not taken much to render me unconscious.