[off topic?]
Back in the day, a scammer would rush into a store and purchase a $5.00 item and then pay with a $100.00 bill. The owner would check the bill, see it was legit and then make change. The scammer would then say something like "I had to get that item for my uncle's birthday. Now that I have that out of the way, let me get some things for myself." They get $90.00 worth of merchandise and pay with cash. Naturally, the cashier assumes they are paying with the change they just got. Nope, the $100.00 was legit, but the rest of the bills are phony.