‘Dad, have you heard of The Mandela Effect?’
‘Nope, can’t say that I have. What is it?’
‘It’s the way loads of people remember something to be a certain way but when they check back it turns out they were wrong. Even though they all remember the exact same wrong thing.’
‘I’m not sure I follow that. Give me an example.’
‘The big example they use is that the line from Snow White is ‘magic mirror on the wall’, not ‘mirror mirror on the wall’ the way most recall it.’
‘Hmmm… Are you sure that’s right?’
‘Absolutely! There lots of other ones like that too. I think there was one about Capt. Kirk never saying ‘beam me up Scotty’ but that doesn’t mean much to me.’
‘Well, it’s very strange. But why is it called The Mandela Effect?’
‘Because most people think Nelson Mandela died in prison in the ‘80’s.’
‘No they don’t!’
‘Yeah, they do.’
‘Dear God, no wonder the world is such a mess.’
‘Some think it is caused by time travellers messing with things.’
‘We’re all doomed.’
‘Other say it because we are constantly moving through alternate realities.’
‘And we deserve to be doomed.’
https://medium.com/predict/the-mandela-effect-fact-or-fiction-db4e8b61d430
https://www.urbandictionary.com/define.php?term=Mandela%20Effect