Here's an animated commercial that Hanna-Barbera made — one I never saw. And why did I, loyal viewer of the kind of shows that aired this kind of commercial, not see it? Because it only ran in the United Kingdom as part of the way Kellogg's cereal were marketing their products over there. The great thing about this is that it features Huckleberry Hound, Mr. Jinks and Yogi Bear — three characters voiced by Daws Butler. Knowing Daws, he probably did this in one or two takes, switching voices off instead of recording each character separately…