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: Did you know that giraffes can weigh up to two tons? Bones: Yes. Everyone knows that. Booth: And they sleep less than two hours a day. Bones: That I did not know. Booth: Yes! Pinky stumps The Brain!