We all know the stage musical HAIR, but the film adaptation, directed by Miloš Forman, came out in 1979, well after the demise of the Age of Aquarius, and thus didn't make much of a dent at the box office. The movie deviates greatly from the original stage production, but Forman, despite being born and raised in Czechoslovakia, manages to capture the zeitgeist of the era. No wonder he'd go on to win an Oscar a few years later for AMADEUS.
Orson Welles directs this adaptation of Kafka's "The Trial" about a man who wakes up in the morning with the police in his room. They tell him that he is on trial but nobody tells him what he is accused of. In order to find out about the reason of the accusation and to protest his innocence, he tries to look behind the facade of the judicial system. But this remains fruitless; there seems to be no chance for him to escape. Watch "The Trial" for free.