Going down a hill.. helmet was clipped to my bag, it swung round and pulled on the front brake lever... straight over the bars, skidded along tarmac on my left arm. Cut all my palm, little finger all the way up, wrist, elbow, and shoulder. That stung for a while but the most painful I've done has to be when I did a drop gap... about 4 1/2 feet high. hands slipped off bars (sweat & rubber doesn't mix well). Landed on two wheels and crown jewels slammed straight into the frame Makes me cringe thinking about it