When I was young sometimes I would just ride circles, figure eights and whatever in an empty parking lot. If my back tire lost traction and slid out from under me no biggie. Been a long time since I did that.

Stupid accident. Last April on a week long business trip in NJ there was no convenient way to rent a bike. So I went to a big box and bought an $80 mountain bike. The store personnel were friendly and helpful. We filled the tires, checked things out and I purchased the bike. Outside I mounted put pressure on the pedal and turned the handlebars. They turned, the wheel didn't. I rolled over on my back and started laughing. Nothing hurt but my pride.

BTW: the bike was junk. It lasted 25 mi, less than 48 hrs before the left pedal broke off. Most of my riding was on pavement. Sometimes you get what you pay for.