Broome says that the origin of her theory came out of a discussion about whether or not Nelson Mandela died in prison. Naturally, this happened backstage at Dragon*Con.
Many people who believe in the theory insist that the popular children's book series The Berenstain Bears was once known as The Berenstein Bears.
Or that Scotland and Wales were once much smaller than they are today, and that Wales bordered Scotland on the east.
Others insist that they have memories of New Zealand, Australia, Sri Lanka, Honduras, and other places being at different places on the globe.
A lot of people believe that the "tank man" in Tiananmen Square was run over by a tank, though he was not.
People have some pretty vivid "memories" of him getting crushed by a tank, though.
A bunch of people remember there being a different Disney World in the Orlando region that was used as a beta test for the real park.
True to the origin of its name, most Mandela Effect believers have memories of people dying at a time other than what has happened in "our timestream."
Broome herself insists that she remembers Billy Graham's funeral being televised simultaneously on many networks around 2009, though he's still alive today.
Others remember that Henry Winkler died during the filming of Happy Days, though he's still alive and working as an actor.
Those people probably never saw Arrested Development?