Out of all of these suggestions I would only give my wallet up to 1 or 2 so far...
Is that the most imaginative thing you guys can come up with?
As for me. One way, perhaps: I show the man my wallet and pictures of 2 adoring children (that were downloaded from someones facebook profile.) Act like a relentless father, putting your photos in the mans face and going on about how they are the cutest kids in the world. Then I ask if he has any pictures of family or friends in his wallet. If he says yes and shows them, it is possible to see how much cash he is carrying thus giving you an idea of if it is worth it. If it is, bring out a gun and aim at his genitals shouting "Do you want to make more kids? If so hand over your wallet or I will shoot your goolies off".