You're despicable became one of Daffy Duck's signature catchphrases in Warner Bros. Looney Tunes cartoons, where the jealous, scheming duck often aimed it at rivals after a scheme backfired. Originally voiced by Mel Blanc, Daffy used the line across classic shorts as a sputtering accusation rather than a serious threat. Decades later the short clip resurfaced on soundboards and in meme edits, where its old cartoon delivery makes modern callouts feel theatrical, petty and instantly recognisable to animation fans.