Thanks to Abstract, I figured I'd start this up. OK, maybe a horrible oversimplification of moral dilemmas, but here it is: You're walking down a city street, and you're passing a very posh hotel. You see a young, obviously rich couple get out of a two-seater Porsche. The guy hands the valet a fairly large tip, and in the process, manages to drop 3 or four $100s on the ground without noticing (maybe he's a little tipsy.) You are the only one who sees the money fall. What do you do?