Back To The Future day is celebrated on October 21st because in Back To The Future Part II, Marty McFly travels to October 21st 2015, to save his children.

October 21st 2015 was still 25 years away when the movie was released in 1989, and the screenwriter picked that date as a potential one that the Chicago Cubs could win the World Series. They lost to the Mets, but beat the Cleveland Indians in 2016 to win…their first in 108 years!

 

 

 

 

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