Come for Batman, the Joker, Catwoman, and Robin lip-synching to "Day-O (The Banana Boat Song)," stay for the inevitable Michael Keaton joke.
This is the product of Franco's partnership with AOL, resulting in the Making a Scene series. in which a Wheel O' Movie Scenes determines the mash-up that must be made. In the third episode, Franco's fateful spins brought him the Banana Boat scene from Beetlejuice and the Joker "make a pencil disappear" scene from The Dark Knight.
Also, Franco has apparently never seen Beetlejuice, because this scene has to be explained to him. That's the most unbelievable part of the video.