Here's a moral dilemma for you... I use this a lot as a sort of loose litmus test for psychopaths...

So ... You're standing on a bridge under which a trolley is barreling toward five people who will certainly die if no one intervenes. The only thing that will stop the trolley is a heavy object set in its path. Conveniently, there is an overweight man standing in front of you, leaning over the bridge. He is the only object in your immediate vicinity that is large enough to stop the trolley.

Do you push him?