"Back to the Future" is just one of those movies that lots of people love. It's probably up there with "Star Wars" as one of the most universally referenced nostalgia movies in pop culture, but we're still suckers for talking about the flaws in Marty McFly's plan to get his parents back together or how time travel actually works.

That's why it's such a joy to listen to Justin Long completely geek out on the 1985 classic. He sat down with MTV News' Josh Horowitz to put his knowledge to the test.

Bonus: Justin Long does one of the best Michael J. Fox impressions you've ever heard.

Check out Justin's killer "Back to the Future" knowledge on the latest episode of After Hours.