The Mandela Effect closing arguments video

The Mandela Effect is a term for where a group of people all mis-remember the same detail, event or physicality. It is named after the instance in which a large group of people all shared the same memory that Nelson Mandela died prior to his actual 2013 death, usually some time in the 1980's. A parallel universe is a hypothetical self-contained separate reality co-existing with one's own. A specific group of parallel universes is called a "multiverse", although this term can also be used to describe the possible parallel universes that constitute reality.