Remember Joaquin Phoenix? Or, more specifically, remember his anti-social publicity campaign to promote an apparently burgeoning hip-hop career? His strange defection from Hollywood involved growing a woolly beard, donning dark sunglasses and gaining a fair bit of weight, and culminated with a truly bizarre appearance on Letterman.

It was a poorly kept secret that Casey Affleck was shooting a mockumentary about Phoenix's rap foray, and today, we have an actual film trailer to scrutinize. The movie is called I'm Still Here, ostensibly a riff on I'm Not There, Todd Sayles' 2007 pseudo-biopic on Bob Dylan. The teaser for I'm Still Here consists of images of Phoenix brooding, brawling, performing, hugging P. Diddy and looking generally enigmatic.

Kudos to everyone involved for keeping a straight face.

So far, the joke hasn't worn out, but I wonder: is the concept sturdy enough to warrant a 90-minute movie?