I rode towards my school's bike rack one time, tried to pop a cool fixed-gear skid towards the rack, and it was just a little bit too wet and I went down HARD. in front of about 10 people...good times. but I'm also "the kid who bikes" and I'm always coming in slightly hurt or with my arm in a sling, as was the case a month or so ago. I don't usually hurt myself on commutes though...