Playing Johnny Cash wasn't enough--now Joaquin Phoenix wants his own musical career... as a hip-hop artist. In his first career move since "retiring" from the film business, the once-exalted actor debuted his rap tracks at a Las Vegas club this weekend. The results? Not pretty. Looking more than a bit unkempt, he stumbled around the stage, even tripping into the crowd at one point. "This is me saying this is who I am. This is my story," he told People.com. "After all the years of reading scripts and reading lines, this is my chance to do something straight from the heart and put it out there." Casey Affleck, Joaquin's brother-in-law, reportedly filmed the graceful performance for an upcoming documentary about his new profession.