Here's a nice one, from 1979. It's a diecast Matchbox "Rice Krispies" car, which was given to kids who took the initiative to mail in several proofs-of-purchase and a buck to cover shipping. Matchbox made cars to correspond with other cereals, too, ranging from "Apple Jacks" to "Corn Flakes" and beyond. The Rice Krispies car is also notable for being the heaviest thing in the bag. Yes, I weighed everything separately. The car won.
