I kind of felt bad doing it....

You should have seen some of the peoples faces as we tested their $20 bills with the counterfiet detection pens at our last Girls Scout Cookie booth.  They were really shocked, and some even seemed insulted, at least until we mentioned that Girls Scouts in other areas had been getting counterfeit money for cookies.  We probably should have checked more of the money but we stuck with the $20's because they were the scariest, especially as people would buy 1 box, and then get the rest back in change.

Oh and we got so lucky, we had an amazing booth sale, our preliminary count was that we sold 407 boxes of cookies in 4 hours, but that doesn't include our Cookies for the Troops.