sighting one

i was walking downtown yesterday and stopped at a light, waiting for it to turn green, when i saw a man riding his bike down the road. it took me a few moments to figure out why he caught my attention. first, he was riding fast, and then i noticed a crutch somehow suspended on the handlebars. i had a sweet thought that he was returning home from buying the crutches for his mother who just had surgery or something. and as he rode past i noticed that only one leg was peddling, and where the other leg should have been, there was just a cut-off pant-leg flapping in the wind. i wonder if there are many one-legged-cyclists.