Cars Land at Disney California Adventure in the DISNEYLAND Resort is a hyper-themed area inside the theme park that is just like walking into the popular film series. One of the more colorful characters is Mater, a good ol' boy tow truck who lives in Radiator Springs.
Disney knew it had to include a Mater themed attraction and it did- Mater's Junkyard Jamboree. The attraction allows guests to ride Mater's tractors while he sings along.
While Mater's voice actor, Larry the Cable Guy, performed the songs he apparently forgot the lyrics at one point. While he assumed that version wouldn't be used, it was included as a joke during a special preview before the land opened. It remained in the rotation, though it is a rarity to hear it.
Mater's Square Dance