WATCH: David Letterman and his very long beard pay visit to “The Ellen DeGeneres Show”

David Letterman divulged to Ellen that he attempted to say hello to tourists taking a celebrity homes tour in Hollywood, but they didn’t recognize they had come face to face with the legendary talk show host. Plus, the comedian commended Ellen on her Netflix standup special “Relatable,” and shared a how he waits for his son Harry to say something funny in order to write new jokes.