(A customer walks in with a pair of glasses.)

Me: “Hi. How can I help you today, sir?”

Customer: “Do you mind pushing the lenses out of this frame for me? My wife wants just the frame for her lab work. She would like to use them as safety glasses.”

Me: “I’m sorry, sir. The frame would be useless if I pushed the lenses out.”

Customer: “No. She’s going to use them as safety glasses in the lab.”

Me: “Are you sure, sir? It wouldn’t meet the standard of safety glasses if it doesn’t have any lenses.”

Customer: “Yes! I’m 100% sure that they will work as safety glasses without any lenses.”

(I remove the lenses for him.)

Me: “Okay. If something was going to fling into her face, whatwould protect her eyes?”

Customer: “These safety glasses!”