I have seen one really bad one, a guy overshot a table by 20 feet, faceplanted, massive head and internal injuries, bled to death two hours later in hospital.
A gy who worked in my ski shop a few years before I got there was in a boardercross race when he landed badly, smashed his upper body. When he sat up, he put a rib through his aorta, died in hospital a few hours later with his family around him.
In tractor pulls, a 'full pull' is the best you can get. Ahh, how sport mirrors life.