I'm talking about . . . coupons. Yep, think of them as warm fuzzies for the next person.
I'm not saying to leave a ton around the store and make a mess for the employees. But if you happen to have an extra coupon, or one that you aren't going to use, then leave it by the product.
If you know of a good sale and can print out the coupons, print on to purposely leave behind for someone else to use.
You never know what little goodies you may find waiting for you!