Sometimes stuff like this makes me think that it's not a good idea to do back flips on large pieces of machinery.
It's too bad the guy died, but I watched that clip and that seems like the dumbest and most boring sport on earth. You jump a snowmobile off a ramp and then stand on your seat. Big deal. You jump a ramp and then spin on your seat. Was anybody still watching when he tried the flip?
In the final seven games of the 2013 season, the Chiefs averaged 34.6 points per game, scored 38 points or more 4 times, and went 2-5. The NFL has ruined the sport.