Your Math Is My Gain

(I hand over a 20 dollar bill to pay for a $14 purchase. The employee incorrectly hands me back $11.)

Me: “You gave me back the wrong change. I gave you a 20. My total was 14, and you gave me back 11.”

Employee: *blank stare*

(I hand back the 10 and 1 dollar bills.)

Me: “You owe me 6, not 11.”

Employee: *blank stare*

Me:  “You gave me too much money.”

Employee: “Well, you don’t have to shop here!”