Worst injury was riding my bike - 12 speed racing. I had the strap type of clips for my feet. We were just leavning a kid's birthday party... my wife was driving and I was going to bike home. Well, I got on my bike, strapped my feet in nice and snug, planning to show off my sprint speed. Unable to turn left because of oncoming traffic, I turned right and went about 2 blocks until it was clear to do a u-turn. I sprinted to show off. Right in front of the house where the birthday party was, my chain snapped. I was still standing and pumping with all my might... I was easily into the 30's at that point. My weight was thrown forward. I went over my handlebars. Did I mention my feet were attached to the pedals? After I passed the bike, it realized that it had to follow me and decided to pass me... Then me past the bike and bike past me, and again.
Witnesses said I did 3 cartwheels in front of them down the road, bouncing off the curb once and through a driveway. The child seat on my bike may have saved me from a broken neck or something - it was pile-driven into the ground at one point. Once I came to a stop, both sets of straps for my feet (and they're pretty strong) had snapped in half. I stood up to attempt to walk it off - my kneecap was perpendicular to my leg. (I made it about 4 steps before dropping to the ground) We suspect now that I may have had a small fracture on my shoulder, but from all the other injuries, that appeared least likely to be broken (and wasn't one of the dozen x-rays taken). Nonetheless, it bothered me for 5 or 6 months. Thank God I was wearing a helmet... my helmet was shattered.