Joaquin Phoenix is a rapper? this is too funny

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I just saw a video of Joaquin Phoenix rapping. He was the actor in Walk the Line and sounded alright there, I have to hope this is a joke becuase I think K-fed might even be better than him. He has got to be on some serious drugs, first of all he looks like he got lost in the mountains somewhere not like a rapper. The other part is he like fell of the stage at the end after a performance that was so funny. I just don't see how this could be true. I heard Casey Affleck is doing a documentary on it, so maybe it is true please let me know any gossip you have or if you think this is true or not?