Maggie: Goodnight , Gracie!
Maggie is frustrated that her little sister Grace is embarrassing her in front of her boyfriend, Eddie, and is trying to make her leave the room. However, it is also a reference to the "Burns and Allen" show.
Burns would end the show by turning to Allen (whose first name was Grace), and say, "Say goodnight, Gracie", and Allen would comedically chime, "Goodnight, Gracie!".