Me: “Okay, ma’am, just slide your card and either select credit or enter your PIN.”

Customer: “It says credit. This is a debit.”

Me: “I know, ma’am. Just enter your PIN for debit.”

Customer: “But it says credit!”

Me: “I know, just put in your PIN like on any debit machine.”

Customer: “But the button on the screen says credit!”

(Seeing no end to this conversation, I put my hand over the screen and block her view of it.)

Me: “Okay, now enter your PIN.”

(She does so, and not surprisingly her groceries are paid for.)