Before (2014)

Victor, a young commercial director living in New York, reluctantly returns to the boring California suburb where he grew up, in order to show off his successes at his high school reunion. While he's home, he reunites with his former best friend, David, who is showing signs of mental illness with paranoid delusions. Victor decides to stay around to help David through his issues by hiring actors to act out his delusions, so that together, they can defeat the forces that David thinks are out to get him, and bring their friendship back to the way it was before.