Isaac Asimov told this joke:
A middle-school teacher invited a Norwegian WWI fighter pilot to his classroom. The pilot told war stories, often referring to "the enemy Fokkers." The kids were laughing every time he said "Fokker" so the teacher interrupted and told the kids that Fokker is a German aircraft manufacturer.
The pilot said, "Ya, dat's true, but these fokkers were flying Messerschmidts."