(referring to Booth scratching his cast) It's kind of gross what...
Brennan: (referring to Booth scratching his cast) It's kind of gross what you're doing.
Booth: Gross? You've got your finger in some guy's maxillary orbit.
Brennan: I don't think there's anything else to be learned here so, let's get this popsicle back to the lab.
Booth: Hey! Look at that. (chuckles) Bones, you made a joke.
Brennan: I can be quite amusing.