From Wikipedia:Spoiler: A spoiler is a piece of information in an article about a narrative work (such as a book, feature film, television show or video game) that reveals plot events or twists, and thus may 'spoil' the experience for any reader who learns details of the plot in this way rather than in the work itself. Articles on the Internet sometimes feature a "spoiler warning" to alert readers to spoilers in the text, which they may then choose to avoid reading.