I was thinking about the joke after i wrote it, and if I was gonna write it again, I would say.
check the color of the person trying to use it. They should be a nice, crisp, clean white. If you notice any discoloration, it looks brown, dark, or swarthy, the bill is suspect and you should not accept.
My amateur comedian sense is that it should sound like you're examining the bill until the end when you realize it was about the skin of the buyer.
Getting a joke right it hard, it has to be the correct length, shouldn't over explain the joke, and it needs be funny. And to this day, I have never heard a good explanation of what makes something funny.
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