(A customer walks in with a saxophone case, looking very worried.)

Me: “Hello, how can I help you today?”

Customer: “I want to sell my violin, it’s in great condition.”

Me: “Certainly, can I see the violin please?”

Customer: “Yes, sure.”

(At this point he opens up the sax case and places a nearly new tenor sax on the table.)

Me: “Uh, sir, that’s a saxophone, not a violin.”

Customer: “No, no, it’s a violin. I’m sure of it.”

Me: “Sir, I’m telling you it’s a saxophone. A violin has strings, and a bow.”

Customer: “No. It’s a violin. You think I don’t know a violin when I see one?”

(The argument continues in this fashion for another 5-10 minutes.)

Me: “Sir, are you still trading this instrument in? We can sort this out later.”

Customer: “…what’s an instrument?”

Me: *face palm*