Leonard: Really? Is this still happening?
Howard: I'm willing to make up, but someone's being a baby.
Sheldon: Ooh! I do love a riddle. Oh, let me see. See, my first guess would be Halley, but that'd be strange to accuse her of being a baby 'cause she is a baby. Um, I suppose it could be Stuart; his head does have a certain milky scent.