Spoiler Alert!

Spoilers get folks upset—really upset. One thing that follows from this is that if you pick up a book that’s all about spoilers, it may seriously disturb you. So anyone reading this book—or even dipping into it—does so at their peril. Spoilers have a long history, going back to the time when some Greek theater-goer shouted “That’s Oedipus’s mom!” But spoilers didn’t use to be so intensely despised as they are today. The new, fierce hatred of spoilers is associated with the Golden Age of television and the ubiquity of DVR/Netflix/Hulu, and the like. Today, most people have their own personal “horror story” about the time when they were subject to the most unfair, unjust, outrageous, and unforgivable spoiler. A first definition of spoiler might be revealing any information about a work of fiction (in any form, such as a book, TV show, or movie) to someone who hasn’t encountered it. But this isn’t quite good enough. It wouldn’t be a spoiler to say “The next Star Trek movie will include a Vulcan.” Nor would it be a spoiler to say, “The story of Shawshank Redemption comes from a short story by Stephen King.” There has to be something at least a bit unexpected or unpredictable about the information, and it has to be important to the content of the work. And you could perpetrate a spoiler by divulging information about something other than a work of fiction, for example details of a sports game, to someone who has tivoed the game but not yet watched it. Timing and other matters of context may make the difference between a spoiler and a non-spoiler. It could be a spoiler to say “There’s a Vulcan in the next Star Trek movie” if spoken to someone raised in North Korea and knowing absolutely nothing about Star Trek. It can also be a spoiler to say something about a movie or TV show when it’s new, and not a spoiler when it has been around for some years. This raises the distinction between “personal spoilers” and “impersonal spoilers.” Personal spoilers are spoilers for some particular individual, because of their circumstances. You should never give personal spoilers (such as when someone says that they have never seen a particular movie,...