Sir Grapefellow was a short-lived cereal created by General Mills around 1972 that featured a British World War I era pilot. The cereal consisted of "grape flavored oat cereal with sweet grape starbits (marshmallows)".
Sir Grapefellow was the arch nemesis to Baron von Redberry (another 1970s General Mills cereal brand). In the vein of the cereal rivalries Quisp & Quake and Count Chocula & Franken Berry bickering over which one was better, Redberry would proclaim, "Baron Von Redberry is der berry goodest!" and Grapefellow would counter, "Sir Grapefellow is the grapest!"