I'll come out of Lurker-ville to comment on this one. First the guys above talking about Karate guys being bad-asses, I'm sorry but that's just not true in my experience. I used to work the door (bouncer) at clubs back in the 80's and I've seen so many Karate black belts get their asses stomped it's not funny, and not by other "martial artists" but by average dudes who didn't take ****e from anybody. And don't get me started on Tae kwan do, Good grief, breaking pine boards? Great. Fighting? Absolute ****e. Second, the guy talking about his friend the "tunnel rat in Nam", he's probably full of ****e. In my current line of work (MRI tech) I hear this BS almost every day from guys who are claustrophobic and feel like they need an excuse because they're ashamed. If someone tells you that, ask to see their Rat tat that they all had, if he doesn't have one he's a liar. There were only around 100 and less than half made it out alive. About 10 years ago a reporter did a story on them and could only find 12 still around. They were almost exclusively asian or hispanic and they ALL were little dudes, so that they could fit in the little tunnels. I literally had 2 guys tell me that BS last week and both of them were over 6 feet tall.