In "A Tree Grows in Springfield", Homer asks for Moe's best beer, so Moe gives him a Duff Adequate. In "The Great Louse Detective", Duffman claims that Duff Stout is "the beer that made Ireland famous". In "Homer the Moe", Moe sells "Malaysian Duff", which is made with soy sauce at his trendy bar. In "The Springfield Files", Moe offers Homer a bottle of "Düff"—a variant allegedly from Sweden, but is actually just a normal bottle of Duff with an accent mark drawn over the U with marker (Pronounced "Doof").