Spoilers for tournaments are where I especially get angry. Especially unintentional spoilers. I don't get as much out the experience when I know the outcome. For instance, if I know a character is going to die in a game, it will often drastically change my approach to the game. For books and movies, it is often not as much of a problem for me. Giving a spoiler, however, can take away from something's replayability, rewatchability, re-x-ability. If you find out a plot twist near the end or something, you might feel an urge to go back through again and see just how that information is important to the rest of the game, the minute details often add so much more to the tale. If I know how it will play out, then I often approach the story from a more objective standpoint, often losing much of the beauty it has to offer in the process.