I dropped one in the middle of a clear day in the dead of summer rolling to a stop at maybe 5mph once h:

I hit the front brake to stop rolling and didn't realize I was on gravel. Front end slid right out on me and I walked off the bike. It was my buddies bike and he had only owned it for 2 weeks when I dumped it which ended up needing a new mirror and had a scratched brake handle. Luckily that was it but it sure was embarassing because there were a few people who saw it happen.