Well, not the dumbest, but certainly one of the dumbest. It was in a small gift shop in New Hampshire in the mid-1990s. Remember Beanie Babies? Of course you do. This store was overflowing with them. In the midst of the displays was a small rack of items for sale. The items on the rack were Beanie Baby tag protectors.
I don't remember how much they were, probably $3 for a package 20 or something. See, if the tag was touched in any way by a bare human hand, if there was so much as a fingerprint visible in the tag's coated glossy surface, the Beanie Baby would be worthless. Hence the Beanie Baby tag protectors, which I am sure were placed on each tag only after the operator was wearing protective gloves.