Be Careful Where You Insert That Battery

Customer: “I need a medical thermometer.”

Me: “A digital one that’s battery-operated or a glass one without a battery?”

Customer: “I don’t know.”

(Since a digital one gives results faster, I grab one and hand it to the customer.)

Customer: “Oh, no, I’ve got one of these at home, but it has no battery, and it’s not working!”

Me: “These run all on battery. Maybe the battery in yours is empty.”

Customer: *thinking hard for a minute* “Maybe that’s why it’s not working anymore.”

Me: *internal facepalm*