Hapax Legomena III: Critical Mass (1971)

The film begins with a black screen; the only thing heard is a man and a woman arguing, repeating and stuttering the various words and phrases they say. Beeps and other noises are added to the audio. As the film progresses, the couple themselves is brought into focus with the dialogue and it becomes apparent that they are arguing over where the man went for a two-day period. The woman asks why she can't know; her boyfriend says it doesn't involve her. The argument goes in circles, never going anywhere and by the end of the film the reason of his disappearance is still unknown. —Tornado_Sam