Casey Affleck has admitted that Joaquin Phoenix's performance in the mockumentary I'm Still Here - including Phoenix's squirm-inducing appearance on The Late Show with David Letterman - was fake. But was Letterman in on the joke?
"Dave knew about it and Dave loved it because he could play along," Bill Scheft, one of Letterman's writers, said in an interview with Nuvo magazine last year.
"I've told people that [everyone was in on the joke], and not only don't people believe me, they tell me that I'm wrong and that [Phoenix] is a schizophrenic and he needs help and he's going to end up like his brother [River]. I said no. I saw the segment notes. It's an act. I saw Ben Affleck's brother taping the whole thing from offstage."
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