Cameron Crowe's Jerry Maguire has plenty of memorable scenes, little moments that have lodged in pop-culture consciousness long after we've all forgotten the particulars of the movie. "You had me at hello." "Show me the money." "Did you know the human head weighs eight pounds?" But one of the most unforgettable scenes isn't a throwaway quote, but the inciting incident, as sports agent Jerry Maguire (Tom Cruise) has a moral epiphany and writes a sprawling mission statement imploring his agency to get back to basics and focus on why they chose their field in the first place. In the movie, it gets Maguire fired and sets the entire storyline in motion. One thing you might not know is that that plot point was, according to Cameron Crowe, inspired by a 1991 memo from then-head of Disney, Jeffrey Katzenberg. Like Maguire, Katzenberg was disenchanted with the state of his business and...