Opposite Day
children's game
Opposite Day is a make believe game usually played by children. Conceptually, Opposite Day is a holiday where things are said and done in an opposite manner. It is not a holiday on any calendar and therefore one can declare that any day of the year is Opposite Day (sometimes retroactively) to indicate something which will be said, or has just been said should be understood opposite to its original meaning (similar to the practice of crossed fingers to automatically nullify promises).
Opposite Day is an example of a paradox; declaring Opposite Day is a self-contradiction meaning that it is in fact not Opposite Day but is at the same time.
Game mechanics
Despite the name, Opposite Day does not necessarily last for one 24-hour calendar day. Opposite Day begins when someone declares it to be Opposite Day, and ends whenever they stop. Participants often need to use reverse psychology and antonyms in order to effectively communicate. People will say one thing when it means another.
In childhood development
The game has also been compared to a children's "philosophy course" in the way that it encourages children to think. While certain things have clear and very obvious opposites, such as "yes" and "no" or "black" and "white", anything outside of a clear binary can be hard to find clear opposites for.
“Opposite Day” enters the record as children's game. Crown Archives preserves that source wording while asking what Opposite, children's and game can confirm, complicate or overturn.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 10, 2026. The linked authority identifier is Q7098613. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Opposite Day” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.