I recently handed a cashier a twenty and a one for a purchase of ten dollars and some cents. She looked quite puzzled. I got back some coins, a five, and five ones -- one of which was the one I'd handed her to begin with. I had to ask for a ten instead of the smaller bills. And told her "that's why I gave you the one-dollar bill in the first place, so I'd get a ten back." OHHHHH!!