Quote from Monica in The One Where Ross and Rachel ... You Know
Monica: How have you been? Richard: Oh, well, obviously you know Barbara and I split up. Otherwise you wouldn't have done the head tilt. Monica: The head tilt? Richard: Yeah. Since the divorce, whenever anybody asks how I am it's always with a sympathetic head tilt. "How you doing? You okay?" Monica: I'm sorry. Richard: It's fine. Believe me, I do it too. I always answer with the "I'm okay" head bob. "I'm okay." "You're sure?" "Yeah, I'm fine."