I have done this three times in three years.

1. I put my right foot down and fell left at a car race. The bottle cage caught the release of my right prosthetic foot propelling it about two feet away. Some people looked on in horror while my friend was laughing so hard he cold not ask if I was alright.

2. I fell leavng the Post Office when I was boxed in by a boy on a bicycle and a mother with a kid in a stroller.

3. I was doing a trackstand at a four-way stop with cars stopped at all four signs. It was my turn to go when the guy to the left decided he had the left-away and sped through the intersection. The partial pedal stroke forward and sudden stop was enough to lose my balance. This was 1/2 block from the Post Office one year later