Well, it wasn't my first clipless incident, but the one on May 5 this year was definitely the worst. I was on a group ride with the folks from Mikes Bike W.C. when we got right hooked by some air-headed cager, forcing us all to stop suddenly and unexpectedly. I'd just put a new set of Look Keo pedals with matching cleats on my bike & shoes respectively, and I had noticed that getting out of them was more difficult than my old Shimano's. Long story short, I didn't get out quite quick enough and went down hard. Embarrassing, but no big deal (or so I thought). I finished out the remaining 13 miles of the ride with some residual soreness, but nothing major. Next morning, as I was getting ready to ride with a different group when I turn the wrong way and heard a loud pop from the hip I'd landed on the day before. The pain was immediate and intense. Long story short, I broke a piece off the top end of my femur, and haven't been cleared to ride by my doctor since.
Arrrrgh!!