(I am a checkout operator in a supermarket, and I have just finished ringing up a customer’s order. )

Me: “So, that comes to a total of $36.76. Is there anything else?”

Customer: “I also want a $50 gift card.”

(I add on the gift card and hand it to her.)

Me: “Okay, now the total is $86.76. Will that be all today?”

Customer: “Yes, thank you.”

Me: “How would you like to pay for your order?”

Customer: “I’d like to use this gift card.” *hands me the same $50 gift card that I just activated for her*

Me: “Uh, you still need to pay for this gift card.”

Customer: “Yes, but I’d like to pay for it with the gift card.”

Me: “But the gift card is worth $50. Your order is $86.76.”

Customer: *rolls eyes* “Uh-huh, so just pay $50 of it with the gift card, and I’ll give you cash for the rest!”

Me: “So that will take your total back to the original $36.76.”

Customer: *looks at me like I’m stupid* “Duh!”