Brennan: (to Christine) Peek-a-boo! Peek-a-boo!
Booth: What are you doing?
Brennan: I don't understand. She was lunging forward at six months, waving good-bye at seven months. She routinely masters tasks several months beyond her age group.
Booth: Ah, she's brilliant. Very smart just like her dad. (Brennan stares at him) Mom.
Brennan: Then she should be able to grasp the conceptual elements of peek-a-boo before the others in daycare.
Booth: Is that some kind of, like, baby Mensa requirement or something?