Worst crash ive seen so far was actually first day of the season last year, and this guy went for a single cork off the first jump @ mountain creek. Well, he under-rotated, and he landed on his arm/shoulder. I was about 10 feet from him, and I swear I heard a snap, like breaking a chicken bone in half.
Stayed with the kid until ski patrol brought him down. His season was over before the end of the first run.