Scanning For Humor

(It’s a busy Saturday in the run up to Christmas. My colleague and I are both serving on the tills. My coworker is scanning the customers items one of which fails to scan.)

Customer: “It didn’t scan! Oh, it must be free!”

Coworker: *long loud clearly fake laugh*

Customer: “Er…”

Coworker: *still laughing hitting the counter with a fist as if in hysterics*

Customer: “You’ve heard that before then?”

Coworker: *normal voice* “Yes, you’re the third today.”

Customer: “Oh… er… sorry.”

(He then paid and left, looking sheepish.)