(The pizza shop I work at sells cups for the fountain soda machine where you fill your drinks yourself. Like most restaurants, we also offer special cups for customers who haven’t purchased a drink.)

Customer: “Excuse me! Your machine is out of [soda brand]. Go back there and change it immediately!”

Me: “Well, I am sorry but we are out [soda brand] and we won’t be getting anymore until tomorrow. All of the other sodas work fine, though.”

Customer: “Then I want a refund!”

Me: “I’m sorry, but I can’t do that.”

Customer: “Why the h*** not?”

Me: “Because that’s a water cup.”