"Sir, would you like to sign up for a Wal-Mart credit card?"
I hate that question. Hate it! Mainly because, if someone REALLY wants one, they will bring it up to the cashier at some point during the checkout process. Instead, the cashier will always say it AFTER all items have been scanned. What's the expected reply?
"Oh, gee, YES! Now that you mention it, I DO want one those!"