Why is there no "all of the above" option? I've been riding the street for 19 years now(since I was 16) and I think I've had at least one stupid get-off or tip-over due to each one of those.
A woman bumped me from behind and knocked me over at a stop light.
A man hesitated at a yield sign in front of me when I had looked back momentarily to check traffic, and I turned around just in time to see my upper smash into his pickup's tailgate.
Hit a speedbump while showing off in a parking lot and pitched it, right in front of a big crowd of girls. THAT was REALLY embarrassing.
Rode through a construction area and bent a rim. While looking down to inspect the damage, my foot slid in some gravel and I fell over at a dead stop.
Ran over a Chihuahua going about 15mph in a neighborhood. Ended up saving it but scratched my lower on a curb, which I didn't notice until later. The dog survived. Had I known about the scratch at the time, he probably wouldn't have.(just kidding, of course)