On my afternoon bicycle ride, I passed a guy blocking the path with his bike while he drank water. A bit later he came storming past me, on a tricky part of the trail - I know because I've crashed all over the place. Anyway, I though "this should be interesting", then got to watch him wipe out just in front of me. He was OK, and waved me past, but didn't pass me again. About 4 miles later, I got a puncture, and got to walk home.