(I was bagging groceries at a till when this occured.)

Me: “Would you like your meat wrapped in plastic?”

Customer: “Why would I want that?”

Me: “Well, it’s to prevent cross contamination. If your chicken were to leak, it could contaminate your beef.”

Customer: “That’s bull!”

Me: “Uh…what?”

Customer: “Cross contamination doesn’t exist any more. It hasn’t for fifty years. Where have you been?”

Me: “…”