i used to do a good deal of mountain biking, but sadly haven't been doing as much as i would like the past 2 years. the worst accident on trails that i've had, i was flying down a hill, hit a slight incline and was airborne, still flying downward. landed on my front wheel, which actually bent sideways at like a 60 degree angle, and pushed myself to the side to avoid crashing my crotch down on the frame. i was ripped up all over from that spill. the best part was seeing everyone's stares as i carried my bike all bloodied and muddied, with my shirt torn up.