We now have video proof of Joaquin Phoenix going batshit insane. The actor followed his rap dreams over much of the past two years and Casey Affleck got it on tape. Whether or not it was planned is still up in the air. Decide for yourself with the first teaser from Yahoo below.

Synopsis: “I’m Still Here” follows Oscar-nominee Joaquin Phoenix as he announces his retirement from a successful film career in the fall of 2008 and sets off to reinvent himself as a hip hop musician.

I’m Still Here hits theaters Sept. 10th.

Are you looking forward to see Phoenix goes absolutely insane while Casey Affleck captures it?

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