(I am working the register at a well-known video game store, when a customer approaches with a stack of games and his son.)

Me: “That will be $87.96.”

Customer: “Here.” *gives me a gift card worth $25*

Me: *processes gift card* “Your balance is $62.96.”

Customer: “What do you I do now?”

Me: “You give me more money.”

Customer: “Oh, sorry. I have never been here before…”