A few years ago an Australian tourist crawled into Binky the Polar Bear's cage at the Alaska Zoo. She escaped with her life, but not with her shoe.
A few minutes ago, I finally got my shoes to clip in to the pedals. I practiced clipping and unclipping and when I finally felt ready to ride, I fell right over. As I write this, I have an ice pack on my knee which is oozing a little blood still, and the bike still has my shoe clipped to its pedal.