(A customer orders an iced drink.  They usually come out with flat lids, but we were completely out and were forced to use the dome ones instead.)

Customer: “Why does this have a round lid on it? I want my drink with a flat lid instead.”

Me: “I’m sorry, but we’re completely out of flat lids today.”

Customer: “But I want my round lid!”

Me: “I promise you, it will taste exactly the same.”

Customer: “Ooohhh…”