For the talent show, Ruby and Petrie decided to remake a scene from "Bone" with Ruby as Thorn and Petrie as Fone Bone. Here, we see them performing their first meeting at the hot springs.
(shortly before this shot)
Ruby: So, are you from around here...
Petire: FONE BONE WHAT'S YOURS!?
now
Both:...
(I love that bit. Poor, poor besotted Fone Bone XD !)