The Show Within a Show, Dog and Bone (obviously an Expy of Johnny and Dukey). When Dog and Bone get transported to Johnny and Dukey's world they still retain their "invincible-because-I'm-a-cartoon-character" trait, yet when Johnny and Dukey get transported into Dog and Bone's world, they don't retain their "being-hit-with-a-frying-pan-hurts" trait.