Ben Stiller shocked the star studded Oscars audience, by impersonating Joaquin Phoenix when he stepped onstage to present the Best Cinematography award.

Mocking Phoenix' recent string of bizarre public appearances, since the Gladiator star 'quit acting', Stiller wore a scruffy fake beard and wandered aimlessly around the stage as co-presenter Natalie Portman introduced the nominees.

And the crowd roared with laughter as he told Portman, "I just wanna retire from being the funny guy", prompting her reply, "You look like you live in a Hasidic meth lab."

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(This news article provided by World Entertainment News Network)