I will say this, I have actually thought of this scenario, and know that I have a certain code that I would apply to if I were to mug someone. If I mug someone, I check their wallet, and if they have more money than I have, I take it, and leave their wallet, otherwise I hand it back to them, and wish them a good day. After handing my wallet, and myself seeing that I have no money, he would hand it back, tip his hat, and go about his day.