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Opposite Day is an unofficial holiday, commonly observed whenever it is declared, where every action is modified so that meaning is negated. Once Opposite Day is declared, statements mean the opposite of what they usually mean. Usually, a person would say, "After this phrase is over, it will be officially opposite day," and then Opposite Day will be officially started. Opposite Day can also be declared retroactively to indicate that what was just asserted had the opposite meaning of what was originally intended (similar to the practice of crossed fingers to automatically nullify promises). Play has been compared to a children's "philosophy course", and the game has been used as an educational aid and suggested as preparation for "standardized testing".
Use in media
Opposite Day Australia: in Australia Opposite Day is celebrated on 5 April. On this day all meanings are inverted. Opposite Days in Filipino Schools in UAE are every Thursday
- In the Seinfeld Episode "The Opposite", character George Costanza says the opposite of everything about himself to get a girl. Though Opposite Day isn't directly mentioned, its rules are followed.
- In the first season of the cartoon SpongeBob SquarePants, an episode was entitled "Opposite Day". In the episode the character Squidward uses the holiday to keep his neighbors from bothering him.
- A Grim Adventures of Billy & Mandy short was entitled and about Opposite Day.
- Indie rock artist Andrew Bird has a song entitled "Opposite Day" on his 2005 album Andrew Bird & the Mysterious Production of Eggs.
- A Sesame Street book entitled Opposite Day was created to teach children about opposites.
- A film entitled Opposite Day starring Ariel Winter is about children switching roles with adults.
- In the "Full Court Dress" episode of Happy Endings, Max complains to Penny about having to babysit his niece and nephew, about the kids' "garbage hipster names", and about their parents' marriage being "doomed" anyway, which he is then revealed to be doing in front of his niece and nephew. In an attempt to cover, Penny tries to explain that Max didn't mean any of it, because it's "Opposite Day". Max then elaborates that their "dad doesn't have a secret Facebook profile under the name Jeffrey Scrotum."
- In the WordGirl episode "Opposite Day", Wordgirl (Becky Botsford) has an Opposite Day party.
- A Cyanide & Happiness animated short shows people behaving differently on opposite day.
- Shelton, Sandi Kahn (2001). Preschool Confidential. Macmillan. pp. 232–234. ISBN 9780312254582.
- Lindsey, Brooklyn E. (2011). Opposite Day: Upside-Down Questions to Keep Students Talking and Listening. Zondervan. p. 69. ISBN 9780310574170.
- "'Grim & Evil' Opposite Day/Emotional Skarr/Look Alive! (2001)". IMDb. Retrieved November 1, 2013.
- "Andrew Bird - The Mysterious Production Of Eggs". Discogs.com. Retrieved November 1, 2013.
- Opposite Day. Publications International, Limited. 2011. ISBN 9781412745673.
- "Opposite Day (2009)". IMDb. Retrieved November 1, 2013.
- "Cyanide & Happiness 'Opposite Day'". Cyanide & Happiness. Retrieved August 21, 2014.