->''"It's his sled. It was his sled from when he was a kid. There, I just saved you two long, boobless hours."''
-->-- '''Peter Griffin''' discussing the TropeNamer from ''Film/CitizenKane'', ''WesternAnimation/FamilyGuy''

A TwistEnding that ''used to be'' guarded carefully as a {{Spoiler}}, but thanks to PopculturalOsmosis, everyone within the target demographic knows the ending already, even those who haven't even seen the show. It's probably never going to surprise anyone again. In many cases, the twist becomes the central fact known even to those only noddingly familiar with the work, and other adaptations take it as read from the beginning.

Naturally, any movie or series that is based on a historical event gets this by default. For example: "The Spartans all die" in ''[[Film/ThreeHundred 300]]'', or "The ship sinks" for ''Film/{{Titanic|1997}}''. It's a ForegoneConclusion.

Named after a line from ''WesternAnimation/FamilyGuy'' where Peter records the above quote over the best-known example of this trope, Creator/OrsonWelles' film ''Film/CitizenKane'' (though ''ComicStrip/{{Peanuts}}'' did a [[http://davidlavery.net/Courses/3870/Films/Peanuts_Kane.jpg similar joke]] decades earlier).

Sometimes the work will be remade/adapted, and the ones responsible will know better. That's when they twist the twist itself, making it NotHisSled.

Compare LateArrivalSpoiler, when marketing assumes the twist has already been spoiled. Contrast AllThereIsToKnowAboutTheCryingGame, where the twist isn't merely common knowledge but the ''only'' thing people know about the work.

We've made a game out of this! Head on over to JustForFun/EverybodyKnowsThat.

'''This just defines a fan-speak term. No examples are needed.'''