In this photo released by CBS, actor Joaquin Phoenix, left, gestures to host David Letterman on the set of the "Late Show with David Letterman," Wednesday, Sept. 22, 2010, in New York. This is ... more 
In this photo released by CBS, actor Joaquin Phoenix, left, gestures to host David Letterman on the set of the "Late Show with David Letterman," Wednesday, Sept. 22, 2010, in New York. This is Phoenix's first television appearance and first visit to the CBS broadcast since February 2009. less 
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Associated Press | Photo By CBS, Jeffrey R. Staab
Wed, Sep 22, 2010 7:57 PM EDT