Maybe the funniest Letterman interview I have ever seen.

For those of you who aren't following the story, Joaquin Phoenix recently announced his retirement from acting and the beginning of his new career: rapping! (It's real footage, but the audio is crappy.) At first I was surprised to hear this, but then I saw Joaquin on Letterman and suddenly understood it all. Joaquin must be on a drug, as he acts crazily enough that Letterman ends the interview by saying, "Well, Joaquin, it's too bad you couldn't be here tonight."