Sports Disasters on TLC. This guy was making runs down some mountain in S. America I think - looked to be volcanic sand/small rock type surface at a severe grade. He went 101mph I think on a “hormal” MTB then rode this custom bike down at 106-7mph. It looked like the head tube just seperated right when he crossed the finish of his run, went down hard but still lived.
It is quite amazing what people do . . .