Joaquin Phoenix's Bizarre Letterman Appearance: (VIDEO)

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Joaquin Phoenix made a bizarre appearance on Wednesday night's Letterman to promote his film "Two Lovers," during what may be his last visit as an actor. Phoenix has insisted he is retiring from film to focus on his hip-hop career.

Phoenix was unresponsive for part of the interview, while giving one word answers for other questions.

As seen in the compilation video below, Phoenix has no sense of humor about Letterman's teasing over his monosyllabic non-answers.

He has an uncomfortable exchange with Paul Shaffer, gets annoyed at the audience and won't even set up the clip from his movie "Two Lovers." That's before he takes the gum out of his mouth and sticks it to Letterman's desk.

Letterman ends the interview with, "Joaquin, I'm sorry you couldn't be here tonight."

It must be seen to be appreciated.

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