(An elderly customer comes up to my checkout.)

Me: “That’ll be [price]."

Customer: “Why is it so much?”

Me: “Well, you bought all these items, and it all adds up to your total.”

Customer: “You charged me for the chicken?”

Me: “Yes, of course.”

Customer: “There’s your mistake. The chickens are free today.”

Me: “I beg your pardon?”

Customer: “I got it from that big display where you’re giving away ‘free range chicken’.”