Seize the Day (1987)

Tommy Wilhelm (Robin Williams) is a salesman. An honest, hard-working guy who has lost his job, his girlfriend, and left part of his sanity behind as he heads to New York to pick up the pieces of his life. He's always been able to sell, but caught in a downward spiral, he must, in addition, face the father who never really understood him, while trying to balance his newly precarious existence.