I think every family had one movie that they just watch nonstop because everyone can agree they like it.
No matter how many times we saw it, the classic time travel comedy always made us laugh.
And the charismatic lead actor, Michael J. Fox, was a big part of the movie's appeal.
Since his Parkinson's disease diagnosis 20 years ago, Fox hasn't been in the spotlight as much, and some of his fans are concerned about the '80s star's health.
Doctors said he would be "pretty much disabled"
After building a successful career with roles on Family Ties and in the Back to the Future trilogy, Fox's career slowed down in the '90s.
The actor was actually privately battling Parkinson's disease, which he had been diagnosed with in 1991.
Parkinson's is a degenerative disease that affects the nervous system. Over time, patients begin to shake, have trouble moving, slow down, and even develop dementia.
Doctors told Fox that he would be "pretty much disabled" in a decade or less. But the actor was more optimistic.
"If you pick me last, I will do everything I can to make you look like a fool," he joked.
And in fact, Fox's career blossomed after his diagnosis.