Got A Chip On Their Shoulder About Using The Chip

(Our chain began using a credit/debit card chip-reader before Christmas, but since most other companies are not yet equipped, a lot of our customers haven’t gotten the hang of it yet.)

Me: “Is that a chipped card, sir? Just slide it into that slot at the bottom, below the number buttons.”

Him: *slightly rude or annoyed tone* “I know how it works!”

Me: *in my head, with a mental smirk* “Then why did you insert the wrong end of your card?”