Sheldon: And then you ask me 20 questions to try to determine which Nobel Prize-winning physicist I am. Ready? Go.
Mrs. Fowler: Can I give up?
Sheldon: No. 19 questions left. (ringtone playing)
Mrs. Fowler: Are you gonna get that?
Sheldon: Oh, no. We're in the middle of a game. 18 questions left.
Mrs. Fowler: Answer the phone, Sheldon.