Oscar-nominated Walk the Line star Joaquin Phoenix announces that he's retiring from acting to launch a hip-hop career as his brother-in-law Casey Affleck captures the curious transition on camera in the film some are labeling an elaborate Andy Kaufman-style prank. In the fall of 2008, Phoenix shocked his fans with the announcement that he would no longer be appearing in features, but instead trying his hand in the music business. In the wake of a particularly bizarre appearance on the Late Show with David Letterman, everyone began to wonder if the eccentric actor had finally fallen off the deep end. In this film, Affleck follows Phoenix as he attempts to convince Sean "Diddy" Combs to produce his debut album, and responds to a request by Ben Stiller to appear in director Noah Baumbach's Greenberg with casual indifference.