On Holloween I busted my knee open in the back of a duece and a half. Does that count?
On that note, I saw a guy rushed to the hospital as the back gate dropped on his head/forearm....kevlar wasn't much use at that point :
Saw another gate dig his rank pins into his forehead by smacking them against the support beams for the canvas cover in the back (Canvas not on, obviously)
Heard of one mysteriously driving off a dock in Kuwait at the SPOD
Less safe than shaving with a straight edge on a roller coaster.