Customer: “Can I have a [competitor's burger] please?”
Me: “I’m sorry, ma’am. We don’t do that burger. The [competitor] is across the street.”
Customer: “But I have a coupon.”
Me: “That does not change the fact that we don’t serve that burger here.”
Customer: “Can you read, mister?”
Me: “Very well.”
Customer: “Well, I can, too! The coupon says available at all locations, smart-a**!