During a hunt Sam accidentally sends a stray shotgun slug into the Impala’s rear door while it was parked, apparently not far enough out of the way. And when the hunts finally over he walks back to the car, trailing behind Dean with a hangdog expression on his face, waiting for him to see what happened. Dean stops and stares at the large round hole, looks to Sam, looks back to the hole, then slowly circles his two of his fingertips around it. Sam’s waiting for the explosion, but all Dean does is stick an exploratory finger inside the hole, offhandedly muttering “you’re paying for the new door…” clearly not quite focused on the reprimand. And suddenly he’s a bit too focused, turning back to Sam and herding him over to the hole he’s made, demanding “come look at what you’ve done.” At Dean’s insistence Sam find himself with his finger in Baby, trying not to cut himself on the jagged metal while Dean watches, a strange fervor in his eye.