The Balloon Man.

Ward Reynard, a struggling writer equally at odds with the Establishment and with himself, turns on with LSD, tunes in to violence, and drops out at the home of his wealthy, protective parents. In his wake are a hospitalized son, injured as much spiritually as physically by his father's betrayal, and a badly shaken wife, Sherry, who has taken a room in a boardinghouse in order to be near her little boy.