Say what you will about Tom Cruise, but the man is dedicated to his craft. A lot of actors do their own stunts at least some of the time, but most of them leave the really dangerous stuff to the professionals. Tom Cruise does them all himself.
In his new film, Mission Impossible: Rogue Nation, there is a scene in which Cruise's character hangs from the outside of a plane as it takes off. In order to get the shot, they actually strapped Tom Cruise to the side of a plane and took off. And not just once -- it took eight takes to get the shot. Now, I've been skydiving, so I can tell you from experience that hanging from a plane is scary as shit, even with a parachute.
Sure, there's the whole scientology thing. But no one can say Tom Cruise doesn't have balls. Big brass ones, I'd say.
Or maybe scientologists can fly.
Watch the scene in the opening seconds of the trailer: