Macy RejectTrivia brain teasers have some element of trivia in them, but they are not just pure trivia questions.
A man was shopping at Macy's one very beautiful day. He bought a very expensive perfume for his wife and paid with a $100 bill. The cashier put a pen to the bill, made a black mark, then told the man that the bill was invalid. How did the cashier know the bill was fake?
AnswerThe pen was a counterfeit detector that most cashiers have. It contains Lugols solution in it that turns dark purple/black when it comes in contact with starch. All paper has starch in it, except the paper that US paper bills are made out of (to prevent counterfeiting).
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