BD-1 happily scans the hand, and makes some appreciative noises about the handiwork. Excitement that is sort of interrupted by Artoo, as he turns around to tell him off. And if this carries on, they might have some sort of fight on their hands, so Cal reaches up to gently bop him on the head.

"And eighteen years ago, he asked permission."

For the most part, he's the only one BD clambers over.