In 1978, for 3 hours, Tow Mater the Tow Truck was chased for 3 hours in the night by the Ghost Light.

Sheriff admonishes him for mocking the urban legend. When McQueen question about the Ghostlight, Sheriff explains that the Ghostlight is a blue paranormal orb of light that haunts Radiator Springs, but Mater reminds Lightning that it isn't real. Sheriff points out that it is real, shocking them. He then tells everyone the tale of the Ghostlight, explaining the disappearance of a young couple that encountered it, leaving behind two "out-of-state license plates" and that it hates the sound of clanking metal. At this point, Mater is so scare that he begins making the noise that the Ghostlight hates the most and tries to stop himself. Sheriff ends the story with a warning that the Ghostlight could be anywhere. 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. Nervous, he returns to the junkyard and sees a shadow of a monster and, in a sudden shock, shines his light on it, revealing it to be just a pile of junk. After his headlight breaks, he enters his wall-less garage and closes the door, which then falls down. A light suddenly appears in front of him and he panics, believing it to be the Ghostlight until he realizes it is just a lighting bug. Suddenly, a blue light appears behind him. After using his mirror to observe it, he runs for it, thinking it is that Ghostlight.

During the body of the short, mayhem ensues as Mater is pursued by the Ghostlight, ultimately revealed to be just a lantern affixed to Mater's towing cable by Lightning and Guido. He drives into Willy's Butte and wakes Frank and his tractors and goes into slow motion where he sounds like a bull. The other residents of Radiator Springs watch as Mater drives around frantically with the "Ghostlight" on his tail, before Mater tires himself out and discovers the truth. 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 jokingly adds that all Mater really had to fear was "The Screaming Banshee" before they all leave Mater, alone and frightened once again.

In a post-credits scene, Mater actually sees The Screaming Banshee but, not realizing it is him, warns him of the Banshee before departing, leaving the monstrous truck confused.

Mater and the ghost light[en.wikipedia.org]
Mater and the ghost light[en.wikipedia.org]
Mater and the ghost light[en.wikipedia.org]