I think the supermarkets would do the shopping public a great service if they had signs over the check-out lanes like the ones they have over the turnpike to warn you of upcoming road hazards.
CAUTION: The person ahead of you has 45 coupons, most of which have expired. She will argue with the checker over each one. The checker doesn’t speak much English. The shopper will also pay with a check using an out-of-state driver’s license. All of the reading material in the check-out lanes are tabloids in Spanish. The good-looking guy who grinned at you in the Produce section is in Lane #4.
Just a thought.