Mandela Effect

The Mandela Effect, or MaE, was a phenomenon where a large number of people apparently misremembered a significant event.

The effect is named after the large number of people who remembered that Nelson Mandela died while imprisoned in the 1980s. In reality, he was released in 1990 and died in 2013.

Professor Maxwell Grey believed a possible explanation of the phenomenon was people recalling the events of an alternate timeline that had been rewritten. (PROSE: The Mandela Effect, Or Monsters on the Streets of London)