[KFC] Receipt Survey: Small Popcorn Chicken with $1 drink [YMMV]
Therefore, by completing their survey's on their receipt and filling in the code, you can get a small popcorn chicken with purchase of a fountain drink.
$1 dollar for coke + small popcorn chicken (or strawberry cheesecake).
currently YMMV as I only got the receipt today and have yet to try it.
picture of the Receipt Survey: