The Returner Versus The Couponator

(I work at a craft store that accepts competitor coupons. After closing time the manager waits by the door to let out customers who stay late.)

Last Customer: “I have a coupon from [Competitor].”

Me: “All right!” *applies coupon* “You total is [total].”

(Finishes transaction.)

Last Customer: *irritably* “Can I have that coupon back?”

Me: “Excuse me?”

Last Customer: “So I can use it at [Competitor], too?”

Me: “I’m sorry, ma’am; I can’t return a coupon that’s already been used.”

Last Customer: *to my manager on her way out* “Your employee was very rude!” *leaves*

Manager: “What did you do to her?”

Me: “She wanted me to give back her used coupon.”

Manager: “Pshh!”

Related:
The Couponator 6: The Coupon Awakens
The Couponator 5: Online Decline
The Couponator 4: Deadly Discounts
Return Of The Returner: The Buyback
Return Of The Returner: Jeans Of Justice
Return Of The Returner: The Return