The skill of WWE, and professional wrestling in general, is to not hurt your opponent, whilst simultaneously making it look like you've just personally signed their death warrant.
The fact is that a vast amount of the moves performed by the guys in the ring are completely safe, but only if you know the secret. Copying many of these outside the ring could legit put you in hospital if you're lucky, or perhaps the morgue if you're unlucky.
It doesn't take a genius to figure out that repeatedly dropping a 250lb man on his head is going to frickingsting, but the fact that these guys tend to bounce back up again in time for the post-match interview makes it easy to forget that this kind of violence can cause serious damage to the brittle human body in the real world.
So putyour best wince on and, for the love of god, don't try this at home...