What was the title of Pixar's 2006 short film featuring Mater and Lightning McQueen before Cars 2?

Mater and the Ghostlight is the 2006 Pixar short featuring Mater and Lightning McQueen before Cars 2.

The short takes place in Radiator Springs and centers on a local ghost story about a blue light called the ghostlight. After Mater plays a series of pranks, the residents decide to frighten him with the legend. The result is a compact comedy built around the same characters and setting as Cars.

Mater and the Ghostlight was released with the Cars home-video package and expands the film's town folklore rather than advancing the main feature-film storyline. Its title is sometimes confused with the later Cars Toons episodes, such as Tokyo Mater and Heavy Metal Mater.

The short is notable because it gives Radiator Springs a supernatural-style campfire tale while remaining family-friendly. It also reinforces Mater's role as the town's mischievous storyteller and Lightning McQueen's amused companion.