Netflix’s new animated movie Thelma the Unicorn is full of soulful rock music, but one number stands out like a neon-colored sore thumb: “Here Comes the Cud.” And that’s deliberate. Flight of the Conchords’ Bret McKenzie designed “Here Comes the Cud” to be as disgustingly catchy and synthetic as possible. Creating a viral sensation — or at least, a number that could pass for a viral sensation within a movie’s fictional world — is a tall order. Thelma directors Jared Hess (Napoleon Dynamite) and Lynn Wang (Cartoon Network’s UniKitty! series) talked to Polygon about how they conceived and planned it.