January 25·Every year

National Opposite Day

The origin of this holiday is disputed, which is appropriately the opposite of clarity. Children observe it by saying the inverse of everything they mean; adults live a version year-round, mostly unintentionally. Calvin of Calvin and Hobbes popularised it in the comics of the 1990s.

Category: Silly
Observed in: United StatesCanada

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Notable · 2011

Arab Spring: The Egyptian revolution began with protests on the "Day of Anger", eventually leading to the removal of President Hosni Mubarak after nearly 30 years of rule.

2019A mining company's dam collapses in Brumadinho, Brazil, a south-eastern city, killing 270 people.
2018An Ariane 5 rocket is launched carrying SES-14, Al Yah 3, and NASA's Global-scale Observations of the Limb and Disk, but the satellites end up in the wrong orbit.
2015A clash in Mamasapano, Maguindanao in the Philippines kills 44 members of Special Action Force (SAF), at least 18 from the Moro Islamic Liberation Front and five from the Bangsamoro Islamic Freedom Fighters.