The breakfast cereal based on the Swedish Chef was called Croonchy Stars and existed for about six months in 1988. The best part about it was the packaging which was covered with puzzles that were way too difficult for children - the one I remember is the challenge to solve Zeno's Paradox. The cereal itself was a Cap'n Crunch knock off with a slightly cardboardish taste and the same mouth serrating texture (How am I supposed to tell what the cereal tastes like without the blood in my mouth.)

As far as I know (and I did check every time that I was at the supermarket), there were only three different box designs. A truly ironic and brilliant moment in breakfast history probably caused by a COO being on vacation or something.