Casey Affleck revealed that the I'm Still Here documentary isn't real, so naturally Joaquin Phoenix went on the Letterman show to make peace with the talk show host...

If you remember, a super awkward Phoenix made a now infamously bizarre appearance on Letterman in early 2009. But last night he said the following to Dave:

    "I mean, I think that you've interviewed many, many people and I assumed that you would know the difference between a character and a real person. I hope I didn't offend you in any way."

Watch the, er, hilariousness above!