Ben Stiller as Joaquin Phoenix

Ben Stiller poked fun at Joaquin Phoenix at the 81th Annual Academy Awards on Sunday February 22. As a co-presenter of Natalie Portman for presenting Best Cinematography award for Slumdog Millionaire, the funny guy mimicked actor Joaquin Phoenix on stage not only wearing the buffy beard and sunglasses but also mocking the latter's recent awkward appearance the Late Show With David Letterman.

Check out a "non-responsive" Ben Stiller as Joaquin Phoenix video below.

Ben Stiller Academy Awards: Ben Stiller as Joaquin Phoenix

Joaquin Phoenix's Bizarre David Letterman Show Appearance