In what might have been the worst-kept secret in the history of Hollywood, Casey Affleck has finally revealed that his new movie, 'I'm Still Here,' was an elaborately crafted mockumentary. The film, which chronicled Joaquin Phoenix's very public meltdown and decision to abandon his acting career for a life as a hip-hop artist, opened in limited release last week -- to less than flattering reviews. The real question is should -- or does -- anyone even care?