General Mills introduced Boo Berry cereal in 1972. The “market’s first cereal that tasted like blueberries,” was third in the line of the company’s monster-themed breakfast cereals, the first two being Franken Berry and Count Chocula. Enjoy what seems to be the first Boo Berry commercial introducing the Peter Lorre-esque mascot voiced by Paul Frees.
*Note: The YouTube poster lists the spot as originating in ’73, and it may indeed have been recorded then, but the official General Mills site lists Boo Berry as being introduced in ’72 – so, I’ll go with that.
(Thanks, Youtube poster CountChoculatte)