An interview gives audiences insight into an actor's upcoming project. One of the most effective ways to promote a film, show, album, book, and more is by appearing as a guest on a talk show. There was a time when everyone wanted to book a spot on TheLate Show with David Letterman;

On Tuesday night, the star said that he originally did the pre-interview in character and “I realized that it was just a little silly, so I called them back and I said, ‘Listen, this is what I’m doing. I’m coming out here and I’m doing this whole thing.’”

The actor was promoting the mockumentary 'I'm Still Here' when he delivered one of the strangest interviews ever recorded for late night television.