Mom: The computer's not scanning my coupon.
Attendant: Oh, that's because these don't take coupons.
Mom: So what am I supposed to do then?
Attendant: Take it to one of the checkout lines.
Mom: When I've already scanned everything here?
The girl rolled her eyes, took the coupon, scanned it in her computer, and then my mother was able to continue her transaction.
How hard would it be to produce a sign on a computer, print it, and hang it up?