Back to the Future Part II Quotes Dr. Emmett Brown: Time traveling is just too dangerous. Better that I devote myself to study the other great mystery of the universe: women! Back to the Future Part II Quotes. Biff Tannen: That's about as funny as a screen door on a battleship. Marty McFly: [under his breath] It's screen door on a submarine, you dork. Permalink: That's about as funny as a screen door on a battleship. It's Added: June 14, 2007; Hey, the big M! How's it hanging, McFly? Needles. Permalink: Hey, the big M! How's it hanging, McFly? Back to the Future Part II is a 1989 American science fiction film directed by Robert Zemeckis and written by Bob Gale. It is the sequel to the 1985 film Back to the Future and the second installment in the Back to the Future trilogy. The film stars Michael J. Fox, Christopher Lloyd, Thomas F. Wilson, and Lea Thompson.