Reddit user TooSkilled edited together all the Enchantment Under the Sea high school dance scenes from Back to the Future I and II into one, real-time clip.

The result?

Over 17-minutes of impressively pretty-much-synced-up scenes of Doc Brown, Marty, Lorraine, and George McFly scrambling to save their futures (some more consciously than others)—with the other Marty attempting to reclaim a copy of a sports almanac Bif had gotten his paws on.

The big takeaways here, as TooSkilled skillfully points out:

TooSkilled shared that they used Sony Vegas software to edit the video:

And out of all that footage from the two films, only one minor error stood out: