Dr. Temperance 'Bones' Brennan:  Sweets ... has scars on his back . Old _ one _ .
Dr. Gordon Wyatt: Really ?
Special Agent Seeley Booth: What kind of scars ?
Dr. Temperance 'Bones' Brennan: Like he 'd been whipped .
Special Agent Seeley Booth: Whipped ?
Dr. Temperance 'Bones' Brennan: I saw them .
Dr. Gordon Wyatt: That explains his near obsession with your childhood trauma .