What would it take for Joaquin Phoenix to come out of retirement?

Despite speculation earlier this year that Phoenix would resume his once-hot acting career with a film adaptation of 'Abraham Lincoln: Vampire Hunter' (the 2010 novel by Seth Grahame-Smith), the actor is now being linked to a much more controversial project.

And if there's one thing Phoenix seems to relish, it's controversy!

Phoenix -- whose last film was the outrageous, head-scratching mockumentary 'I'm Still Here' -- is now rumored to be reversing his retirement plans to co-star in Paul Thomas Anderson's much-anticipated movie taking aim at Scientology.