Casey Affleck admits to Joaquin Phoenix hoax

3:11 PM PDT 9/16/2010 by Staff report, AP

Phoenix put on an act for documentary, Letterman visit

Casey Affleck admitted to The New York Times Thursday that the strange behavior of actor Joaquin Phoenix is a put-on, staged for the documentary on which they collaborated, "I'm Still Here," and the infamous 2009 appearance on "Late Show with David Letterman."