Originally Posted by Drake
I'd also add that there's something called "Blank-fire Non-Guns" which are built-as-prop "guns". As someone above mentioned, blank-firing guns aren't "safe", and that not only because of the examples cited; a blank generates enough power to cycle the gun, and while no projectile is launched there's still a very powerful muzzle blast. (There was an incident (and probably others) were an actor from a TV show was messing around with a blank-firing gun and shot himself in the head with it as a "joke"; the muzzle blast caused brain death.)
That was the actor from the movie the crow if im not mistaken.