Inquiring Nuns (1968)
Inquiring Nuns is 1968 Kartemquin Films production directed by Gordon Quinn and Gerald Temaner. In the film, two young nuns visit a variety of locales in the city of Chicago, asking people the question, "Are you happy?" They meet a variety of individuals ranging from hippie musicians to intellectuals, whose responses are everything from the mundane to the spiritual. The film was directly influenced by Jean Rouch's Chronicle of a Summer.
More at Wikipedia.