Yet another WTF moment I could have done without...

I dropped some change just now...I'm stooping to get it.  This guy asks me if I have it.  I say "Yeah."  Guess what he proceeds to do?  He picks up my change and doesn't give it back to me, he puts it in his own pockets.  }:O  There were people looking on, but they said nothing. WTF???!!!! With the morning I've had, I wanted to go off on him, but I thought to myself "Why waste the energy?".  If he had the audacity to steal my own change in front of my face, he must've needed it.  I can't think of anything else that would make someone do something like that.  I would've given it to him if he'd asked, but to just take it?