I've known a few people (kids) that died riding snow mobiles, and they weren't even trying to jump them. There massive machines that are not mean't to be flipped. But, that's the risk extreme sports athletes are willing to take. As a former skateboarder, with aspirations to to it for a living...watching what kids are willing to risk, I had to hang it up. I decided to go to college instead.
R.I.P. Caleb Moore...truly a beast.