[Big Poppa Smurf]

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my favorite is when your total is 15.xx-16 dollars and you give the cashier 21 dollars. invariably they tell you that it's only 16 dollars. then they try and give you the single back. then you tell them you want a five back. they look at you quizically. i have resorted to just telling them to punch 21 into the cash register and give me the change.

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It's because when cashiers get trained nowadays no one teaches them this stuff, so when you do it to a cashier they get confused. Also all cashiers think all customers are retards so they just assume that the customer somehow got the price wrong (which happens all the time).