Watching this video makes me realize how much he looks like Will Sasso. Maybe Will could play him in a mocumentary. Wait, maybe this IS Will Sasso! Dun Dun DUUUUN!!!

It looks like a hoax to me. Casey Affleck is filming a documentary about Pheonix's road to becoming a rapper, which smells a lot like a mocumentary when you consider the red carpet incident where Affleck did a poor acting job of seeming dismayed by the interviewer's line of questioning.

Comment hidden because you are ignoring dag. (show it anyway)

Yeah, totally not real. They are dead-panning in the mocumentary style. But upvote for good performances and a quality theatrical laugh from the sidekick.