[ryanmcbride]

US currency has serial numbers printed on both sides of the bill, and while you might be able to cut it up in such a way that they aren't included, I believe they also put it in the watermarks, so even if there is a strategic way to cut it that hides the watermarks and serial numbers, I think they'd start to catch on before you made much. It's an interesting thought experiment though. How many banks would you be able to try it at before they caught on?