This happened a long time ago, but I think it fits:
I was running drops on my old Super-V. i had taken off the original MOTO front fork (bad idea) and was using a Manitou that I had gotten a good deal on at a LBS.
Well, on the ramp up to the jump, the goddam crown cracked, and the fork basically fell apart in midair. When I hit, the fork collapsed, I endo'd, and ended up with a cracked collar bone.