Auto-B-Good - Sticking to It!: A Lesson in Trustworthiness

Professor needs someone to fetch more of his Super Delicious Cotton Candy for the Vehicleville carnival. Hotshot Johnny and modest Derek both promise to deliver, but can they resist the temptation to have a nibble of candy on the trek back? The cars realize how important it is to be trustworthy, and how easily that quality is lost.