When the new Nicholas Sparks adaptation Dear John opens today, confusion will reign across the land. Many fans of The Notebook will head to YouTube to watch a trailer, only to be confused as to when Sparks switched from writing about young buff love to focusing on schlubby middle-aged divorcés. Meanwhile, another contingent will excitedly rush to the theater, buy a $10 ticket, and be infuriated to find a lot of weepy romance when they were hoping for a big-screen reboot of the late-eighties NBC sitcom. How to prevent the anarchy and disappointment that will surely result in this duplicated title? Hopefully this chart will help.