Toy Car Story is a movie in the credits of Cars being shown at the Radiator Springs Drive-In Theatre. It is a film made with cars that closely follows the plot of Pixar's first film Toy Story and features Woody, Buzz Light Car and Hamm.
The car version of Woody yells to the car version of Buzz, "YOU ARE A TOY CAR!" Leaving Buzz to reply, "You are a sad, strange little wagon, and you have my pity. Farewell." (Replacing "man" with "wagon") Woody then says, "Oh, yeah? Well, good riddance, you looney!" In the second scene, the car version of Hamm says, "Hey, I hate to break up the road rally, guys, but, they're here! Birthday guests at 3:00!"
Then Mack, who was watching the movie, says, "Oh, man! Whoever does the voice of that piggy truck, I'm tellin' ya, he's one great actor!" A nod to the fact they share the voice actor, John Ratzenberger.