Which Pixar Cars short follows Mater as he encounters a ghostlight in Radiator Springs?

Mater and the Ghostlight is the Pixar Cars short in which Mater encounters a ghostlight in Radiator Springs.

The short is part of the Cars Toons series and centers on a spooky local legend. After Mater plays a prank on the other residents, the community tells him about the ghostlight, a mysterious blue light said to haunt the town at night.

The story mixes comedy with a traditional roadside ghost tale. Its title makes the subject specific: it is not the separate shorts Tokyo Mater, Rescue Squad Mater, or Unidentified Flying Mater, all of which feature Mater in different adventures.

Mater and the Ghostlight was released in 2006 and was included with home-video editions of Cars. It is notable for expanding Radiator Springs beyond the events of the feature film while keeping the town's residents together.