hey now that I think about it! I crashed ALOT on my bike when I was young!
the chain thing was so annoying, I had an old bmx.. and it had a warped crank so if I pedalled really hard standing, it would fall and well, you know the rest... my voice was high pitched for a week

I did the same thing russel did, on my bike going down a hill FULL speed!!! I was going to jump up on a sidewalk thinking I was pro, when I jumped up.. it was way to early.. so the bike came down right on the corner of the curb! I went flying like a mofo and also got knocked out.. all's I rememeber were some old people beside me kept askin me if I was ok,
I also had the incident of going down full speed ON a sidewalk... and out of no where, the T on the road...a van pops out and stops... I went FLYING into the fender over her hood and on the road... she brought me home, and yelled at my mom for my bike not having any brakes! LOL
it was my grade 7 teacher to!! coming home from her day of work!