As the exact date of the 30th anniversary of the release of the 1989 Batman film is a mere two weeks away, it's time to ramp up the celebration quickly with some great material I've found.
In this clip, Michael Keaton appears on NBC's Late Night with David Letterman the night before the release to promote the film and shoot the breeze with Dave. You can tell that Keaton and Letterman are old friends having a good time. I watched this episode the night it aired and distinctly remember the story Keaton tells about himself and Jack Nicholson checking out each other's costumes for the first time.
Also do yourself a favor and watch the guys' cringe-worthy performance back when they were cast members of Mary Tyler Moore's variety show from the late 70s.