Sheila and the Brainstem

Taz, a nutty visionary in the American Southwest, has misplaced the wizened dried-out Brainstem he found in a mysterious subterranean world and believes is the key to immortality. Three rebellious punks—Sean, Head, and Billy Dork—unknowingly steal it during a convenience store robbery, thinking it's beef jerky. Newlyweds Bruce and Sheila stumble into the confrontation. The punks kidnap Sheila, Taz kidnaps Bruce, and a bizarre chase ensues across identical convenience stores and housing developments.