I once heard that all movie plots fall into just two categories: a boy (or girl) leaves home and a stranger comes to town. Someone else said that every movie story is about the search for authenticity. In my book, I list thirteen plots, from the classic antagonists/strangers on a journey ("Wizard of Oz," "Midnight Run," "It Happened One Night," "Toy Story") to the ups and downs and sometimes ups again of romance ("An Affair to Remember,""Annie Hall,"...