About a month ago I bought a package of cheese nips that were burnt. I didn't think anything would come of it but I emailed nabisco with the problem and codes on the boxes.
Yesterday I got a coupon for any nabisco product for free (up to a $4.49 value). And a nice little letter expressing apologies and the usual form letter pleasantries.
Not only am I happy with the coupon, but that they were so prompt to reply to me.