Well it happens to all of us...though as far as I know, I`m the only one who achieved it by falling asleep for a split second riding a bike...
I`m completely serious, I have done it walking, but riding a bike is so much worst. Proven when I impacted with the street.><
Let me tell you, it was so fun leaving my bike at my cousin's (twisted handles) and walking the half mile back to my hour (maybe more, maybe less).
What amused me most would have to be the fact that my knee got all scraped RIGHT next to my old scar from the ten second car ride I had from behind it. Coincidence? Maybe, maybe not. I`m still amused by the whole thing.^^