The sound comes from Rabbit of Seville, the 1950 Bugs Bunny cartoon that parodies Gioachino Rossini's opera The Barber of Seville, first performed in 1816. In the short, Bugs leads Elmer Fudd through a barbershop in time to the music, turning the famous Figaro aria into visual comedy. The cartoon has been reissued and referenced for decades, and short clips of its singing are now shared online in Spanish and English as a meme for barber scenes, makeovers and pompous entrances that need instant classical flair.