A Deafening Mumble

Coworker: “That is [amount], please. Are you paying with cash or card?”

Customer: “What?”

Coworker: “Cash or card?”

Customer: “I can’t hear you.”

Coworker: *raising his voice* “Cash or card?”

Coworker: “Stop mumbling. Didn’t your mother teach you about mumbling?!”

Coworker: *yelling* “CASH OR CARD?!”

Customer: “All right, all right, you don’t have to shout! How much is it?”

Coworker: “[Amount].”

Customer: “What?”

(I have yet to see someone go so completely dead behind the eyes since.)