Well, it sounds a little worse than it actually was, it was only partly my fault. I was in a competition, doing Kumite. The guy I was sparring started to blitz towards me. I started stepping back at a rather rapid pace. As I did this, he swept my front leg. With the momentum of my already moving leg and the redirection from the sweep, my heel came hurtling at a rapid pace towards my Jatz Crackers..... and connected. Needless to say, I dropped to the deck like a sack of spuds, as did the people around me.... laughing.