Frequently, I get a strip of coupons or other promotional
items from a little printer at the checkout of my local grocery.

Coupons emerge as a thank-you for purchasing a product, or
based on some other derived data.

Yesterday, after buying a couple pints of Ben & Jerry's
Ice Cream (my favorite bad-for-me snack food), I got the
following checkout coupons in sequence: 

    Save 55c on Two(2) Pints Ben & Jerry's Ice Cream Free
    High Cholesterol Survival Guide