 The title comes from a William Goldman quote from his book  "Adventures in the Screen Trade", where he says that "the single  most important fact, perhaps, of the entire movie industry" is that  nobody knows anything. If there is a Roman numeral I to this book,  thats it.... Not one person in the entire motion picture field  knows for a certainty whats going to work. Every time out its a  guess and, if youre lucky, an educated one."