Watch HappyHead for Free: How to Stream the Movie Online at 123Movies. . When Seb is offered a place on a radical retreat designed to solve the national crisis of teenage unhappiness, he is determined to change how people see him and make his parents proud. But as he finds himself drawn to the enigmatic Finn, Seb starts to question the true nature of the challenges they must undergo. The deeper into the programme the boys get, the more disturbing the assessments become, until it’s clear there may be no escape...