What is the Mandela Effect and what do proponents of this confusing phenomenon consider as evidence? Some people are convinced that this is proof that the world has either slipped into an alternate timeline or that we have somehow crossed over into a parallel universe.

Music and effects from the following sources:

https://www.youtube.com/watch?v=AgcTvoWjZJU

https://www.youtube.com/watch?v=fJ9rUzIMcZQ

https://www.youtube.com/watch?v=aUKwer73D1I