I've never seen anything like it. A valid check, a valid account, made out in the amount of $6 attached to the inside of a box of Trix cereal I bought for less than $2.
It's for children's admission to a movie promotion (Looney Tunes: Back in Action specifically) but it's a real check. Private currency schemes, in the form of coupons, points programs, etc are getting more and more sophisticated and likely to get more convertible as time goes on. This is a new one for me though. An honest amount of negotiable cash stuck in a cereal box at a value level that exceeds the purchase price of the good.
A check.
Astounding.