Most of the time the cashiers who can't count change or do simple math irritate the hell out of me, but occasionally I throw them the ultimate curveball just for laughs. Say the purchase comes to $7.27- I hand them $10.27 and watch the hilarity- they are simply lost, totally & completely. When I explain it to them, they think I'm trying to pull a fast one, and always want to give the 27 cents back. It becomes pretty obvious why these kids get into trouble with credit cards & car loans- they have virtually no education or common sense when it comes to money.
Years ago my wife worked with a young girl who bought a new car, and she was proud to show it off. When asked what she paid, the girl replied "$435 a month". My wife pressed further wanting the total price paid for the car, but the only answer she could got was "$435 a month". She couldn't even tell us how many months. My wife & I sat down with the girl, her paperwork, a calculator, and a KBB. Turns out she bought a $34,000 car, put $10,500 down, bought all the extended warranties, paint sealant, undercoating, tire warranties, etc, & had a 7 year loan at a ridiculously high interest rate, and was going to end up paying almost $70,000 for the car. On top of that, she traded in a car worth $2350 and just signed over the title, receiving nothing for it. We tried to get her to go to the local news or the attorney general, but she was too embarrassed.
She is probably Obama's financial czar now.