After everything that Brennan and Booth have been through lately, with their lives being in danger and their own struggles in their relationship, it's nice to see Brennan looking so happy in this scene.
After having a surprising conversation at home, Booth and Brennan arrive to a crime scene to find some incredibly disgusting remains. It also has to be getting time for Brennan to have the baby soon, right?
Booth: I worked really, really hard on my vows, but you know, now that we're here, look, um, hey. Do you remember the last time that we were here? Standing right around in this spot? It was right in the beginning before we really knew each other. I was trying to get away from you because you were irritating me and, uh, you chased me down, and you caught up to me and I said to you 'listen, I just have to get all my ducks in a row' and you said to me-- Brennan: I can be a duck. Booth: Yeah. You know we had been chasing each other for a long time. Chasing each other through wars and serial killers and ghosts and snakes. And now chasing you has been the smartest thing that I have ever done in my life. And being chased by you has been my greatest joy. But now, we, uh, we don't have to chase each other anymore because we caught each other.