I heard somewhere, actually, that WWE performers have a higher incident of injury than any Japanese federation. That may be because they work like four times a week, though.
It's cause they're so roided up the meat just comes right off the bone. Seriously - one of the many downsides of steroid-enhanced physiques is that the muscles tear reeeeeaaally easily.
Three years later, Vader would help rip Mick Foley's ear off. I'm waiting for Mick Foley to knock somebody's nose off or something next, and then that guy makes somebody's mouth fall off.