I had a nice little mishap with the high-school parkinglot next to where I live. I was doing laps around it, trying faster and faster each time, I was spinning * 2 in 52-11 around a corner when I suddenly hit a patch of sand. My bike slammed into the curb and I was thrown (with my bike) into a chainlink fence (OUCH), I had to call for a ride home so I could nurse my wounds.

So, my words of wisdom, if you try this type of activity, bring a broom or find another parkinglot.