American Buffalo

Based on Mamet's hugely popular and influential play.
For down-and-out junk dealer Don, life goes from unlucky to unbearable when he discovers the rare buffalo head nickel he just sold for $90 is worth ten times as much. Refusing to let himself be out-swindled, he enlists a young protege in a scheme to steal the coin back. But their plans are suddenly altered by the intrusion of Teach (Hoffman), a disturbingly aggressive would-be thief who badgers Don into cutting him in on the heist - a decision that carries explosive consequences for everyone involved.