Joaquin phoenix on Letterman

Two time academy award winning Joaquin Phoenix was on the Letterman show. The mumbling yet nervous Phoenix was asked a series of questions from Letterman about his new movie "Two Lovers." Fidgeting and hiding behind dark shades and giving curt answers displayed a few of Phoenix awkward behavior. Phoenix said, "That's just a nervous tick, I think." Which explained his fidgeting. He did not find some of Letterman comments so humorous as much as the audience did when asked by Letterman,"What can you tell us about your days with the uni bomber?" When Letterman seen that their was no response to the joke he followed up saying, "It's just a little joke."When asked about continuing his acting career, Phoenix responded saying, " Never say never right? I don't know." When asked what he would do now,Joaquin said," I'm working on my music." His response left the audience laughing at the genre selection that he said he is working on, hip hop. At one time in the interview Phoenix seemed frustrated and impatient when asked about clips in the movie, saying that he haven't seen the movie. Even saying, " Are you fucking serious?" to the laughter of the audience about him not knowing the movie clips, having yet seen the movie. Chewing gum seemed to annoy Letterman, well it was just a joke when he told Phoenix I'll come to your house and chew gum. Phoenix didn't find that funny either, which showed when he placed the gum under the desk of which he was sitting beside. The interview ended with Letterman saying, "Joaquin I'm sorry you couldn't be here tonight." The audience and surprisingly Joaquin laughed in unison. So really what was his problem?