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"The Parts in the Sum of the Whole" -- Season 5, episode 16
This flashback episode shows that Booth and Brennan actually kissed way earlier than we ever knew. In fact, they kissed on their first case. Too bad they soon got irritated with each other, thus setting up the relationship seen in the series premiere. Oh, and Booth tells Brennan he loves her. She doesn't go for it.
Apr. 29, 2013