[Flashback to Booth and Brennan's first case]
Booth: Listen, I've got something to confess.
Brennan: Is it the fact that you're a direct descendant of John Wilkes Booth? I already know that.
Booth: Wait, wait a second. How do you know that?
Brennan: From your bone structure.
Booth: Keep that under your hat for now, okay?
Brennan: [laughs] Okay.

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