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A writer on David Letterman's Late Show has claimed that Joaquin Phoenix’s apparently incoherent appearance on the show last year was an act for the mockumentary I’m Still Here.

The film was confirmed as a fake by director Casey Affleck last Friday when, speaking to the New York Times, he described Phoenix’s act as “the performance of his career” before acknowledging that the interview was part of the act, although Letterman himself was not in on the secret.

However, in an interview for Nuvo carried out last summer, writer Bill Scheft noted how the host was in fact “play[ing] along”.

"He could do whatever he wanted with it. And he did, and it was great television,” he said, before describing how he “saw Ben Affleck’s brother taping the whole thing from offstage.

"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”.

Phoenix will return to The Late Show for another interview this Wednesday.