This is from the groaners listserve. The author is unknown.

While handing a 25 cents-off coupon to the supermarket clerk at the checkout counter, a woman inadvertently missed her hand, and the coupon slipped beneath the scale and was gone.

The checker looked distressed, so the woman said, “That’s Okay, it’s in Coupon Heaven, now.”

“Coupon Heaven?”, the checker said.

“Yes”, the woman said, “That’s where coupons go when they die.”

“Only the redeemed ones!” said the checker.