I work in the kitchen department. A woman comes in with a meat thermometer inside its open plastic container.

Customer: “I need to return this. The display keeps reading zero even though the meat is fresh from the oven!”

Me: “That does indeed sound broken. Grab another one for an exchange, and I’ll get you on your way.”

She goes into the department to get one, but then comes back, frustrated.

Customer: “They’re all like that! I think you got sent a bad batch!”

Me: “Yes, ma’am, because those are the stickers on the display—ooooh.”

I realize what happened. A half-second later, so did the customer. She picks up the thermometer she’s returning, looks (actually looks) at the display, and peels off the sticker. Red-faced, she runs out of the store.