In one of their few promotional tie-ins, Kukla and Ollie ice cream spoons were offered in 1950 by Sealtest.  Made of Wallace silverplate, they're "extra fun" to eat ice cream with and actually not that hard to come by.  But the really rare pieces are the non-character spoons that came with them.  Apparently no one saved those, so getting a set of all 6 spoons is very hard - I finally found a picture of a complete set, at the bottom of this page. And, after years of searching, I found the box they came in!
Click on the ad to see a larger version.
Click on the video image to see the spoon commercial.