Mater and the Ghostlight

Mater and the Ghostlight is a 2006 Pixar computeranimated short created for the DVD of Cars, which was released in the United States and Canada on November 7, 2006. The short, set in the Cars world, tells a story of Mater being haunted by a mysterious blue light.

Sheriff admonishes him for mocking the urban legend, and then tells the tale of the Ghostlight. The rest of the gang say goodnight and turn off all the store lights, leaving a nervous and scared Mater all alone in the dark.During the body of the short, mayhem ensues as Mater is pursued by the Ghostlight...ultimately revealed to be just a lantern affixed to Maters towing cable by Lightning and Guido. The other residents of Radiator Springs watch as Mater drives around frantically with the Ghostlight on his tail, before Mater tires himself out and the cars tell him it was all a prank to pay him back for all his pranks he played on them. Sheriff gently tells Mater that the only thing to be scared of on Route 66 is his imagination. Doc then jokes that all Mater really had to fear was The Screaming Banshee before they all leave Mater, all alone and frightened once again. ........

Source: Wikipedia