Killerball - S3-E18
Continuity mistake: When Randy laughs frantically after the Hensons told him they have been abused by a Dobermann, he's near a billiards table where there are two balls. At the end of the scene another ball appears on the table from nowhere.
Answer: The premise of the show is he atones for mistakes he did in the past. Winning a car for Joy probably atones for something he did wrong regarding her in the past.
Rob245