You're in an elevator and the lights go out. And then....

Brazilian TV show Programa Silvio Santos has a prank that would scare the shit out of me. Watch it you will not be disappointed.
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I seriously don’t know what I would do if that happened to me. Being cynical, I would like to think that I’d be stunned, then laugh it off knowing its a prank. It doesn’t seem a surprise to me that all of the victims are middle aged. I think they’d be fearful for the girl’s life if they pulled it on some young college-aged guy. I wouldn’t know if I would stay back and be horrified or punch her, and I’ve dreamed about punching a lot of ghosts. What would you do?

There’s a thread on this video, but with a slightly different subject - Why do people not attack the threat in a situation like that? - In My Humble Opinion - Straight Dope Message Board

We have more little girl punchers than I would have thought.

Look in the other thread though. There’s a link to a guy actually getting punched in a gag (if it’s real).