When Joaquin Phoenix grew a scary beard and started behaving erratically during interviews, we were genuinely worried that he was suffering some sort of breakdown. Then he started rapping, too and well...then we were convinced. During this time, the actor's pal Casey Affleck (brother of Ben) was following Joaquin around directing a mockumentary entitled I’m Still Here: The Lost Year Of Joaquin Phoenix - and this is the first trailer for the finished film. Whatever your views on Joaquin, you can't deny that what was really going on with him during this time is hugely intriguing. Have a watch and then tell us your views. We can't wait to see it.