When I was a kid, a friend and I decided we'd start a bicycle circus. I figured my trick would be to ride standing up on my saddle, hands high over head. I got the bike going as fast as I could, and began attempting to stand on it. I wasn't wearing a shirt, by the way. Moments later I did a belly slam onto my street, which was paved with asphalt and loose cinders on the edges. They were picking cinders from under my skin from head to toe for quite some time.