“Mother Sky” from Can’s Soundtracks album was used to great effect in Jerzy Skolimowski’s Deep End (AKA “La Ragazza Del Bagno Pubblico”) the tale of a teenage stalker obsessed with a beautiful young woman (model Jane Asher, Paul McCartney’s pre-Linda 60s girlfriend) who is his coworker at a pool and bathhouse. 
 

 
Deep End was thought to be “lost” but a new film print was released in British cinemas in 2011, with a deluxe BFI produced Blu-ray DVD coming soon after. You can occasionally catch it on Turner Classic Movies. In a 1982 interview with Kristine McKenna for the NME, director David Lynch described Deep End as the only film he ever liked that was shot in color.

Below, the frantic “Mother Sky” as the number was used in the film:
 

 
A gorgeous version of Cat Stevens’ “But I Might Die Tonight”—considerably different from the one heard on Tea for the Tillerman—is used briefly during the film’s final moments.
 

 
Bonus, a blistering live version of “Mother Sky” on German television, 1970.  Holger Czukay, Irmin Schmidt, human metronome Jaki Liebezeit, Michael Karoli and the most singular vocalist in all of rock history, Damo Suzuki. Complete with German hippie chick hitting on a bowl of hash!