My wife managed a Wendy's for a couple years.  Someone had evidently robbed their parents, or grandparents Silver stash, because they were coming into store paying for food with Silver coins.  The front desk girls took the Silver coins and brought them to my wife, and said, "This money don't look right", like they thought it was fake money, and they were afraid they were going to have to cover the loss.  My wife said, "Every time this happens, just bring it to me, and I will give you real money".  Over the course of time, they brought her coins that valued something like $200.00 in Silver. They thought the real Silver coins were fake, while it the other way around lol. Think about how easy it would be to rip off the non-thinkers when they pay for anything with cash that required the giving of change, like at fast-food drive thru.  Not a fortune to be made doing this, but I bet it's going on.  Someone pulls thru, orders $5.25 worth of food, pays with a ten, and is returned $2.75 change, and burger flipper pockets two dollars.  When you make minimum wage you could easily boost your earnings.