In 2005, a forum-goer named Nathan Poe pronounced one of the most quintessential Internet laws: Without a winkie or other “blatant display of humor,” parodies of extreme views can’t be distinguished from the genuine article. Poe’s Law has been proven innumerable times, but never quite like this.

Some genius has made a video titled “BACK TO THE FUTURE predicts 9/11.” And it straddles the line between trolling … and deadly seriousness.

The 12-minute video, credited to a collective of artists and “synchromystics” — more on them later — has been online since late July. But it began making the Twitter rounds only this week, presumably because tomorrow, Oct. 21, 2015, marks unofficial “Back to the Future” day — the day Marty McFly and Doc Brown traveled to in 1989’s “Back to the Future Part 2.”

From the video’s first seconds, it seems like an obvious joke. It ticks off every box on the YouTube conspiracy-video checklist: the authoritative male voiceover; a preponderance of red circles and arrows; the repeated claims that things are obvious or evident when they are actually impossible.

At 4:05, the narrator even manages to sneak in the obligatory Illuminati reference: Why, he demands, does the all-seeing eye appear on a storefront in the background of one scene for a split second?

Although the video isn’t entirely sincere, it’s also not a parody or joke. (This sort of middle ground was not accounted for by Poe!) The guys behind the video do not actually think Robert Zemeckis predicted the Sept.11, 2001, attacks, as they explain in an opening slide. But they do believe that 9/11 and “Back to the Future” — and everything in the universe, really — are connected by a vast Web of unseen, mystical, esoteric ties.

This belief, dubbed “synchromysticism,” has attracted a small but devoted following online. And some of its practitioners make these things called “sync films”: an art form that explores the “conscious connective fabric that ties together all matter and energy within the universe.”

As if to prove that all things are connected, the synchromystics have also made videos implicating “Back to the Future” in everything from Roswell to JFK’s assassination. Not that they actually think Zemeckis was involved in that stuff! But spiritually, metaphysically, he might have been — if that’s the “true nature of coincidence.”

“By documenting the interconnected patterns we observe, I believe we have become fractal cartographers — mapping the invisible landscapes of a quantum and/or holographic universe,” writes synchromystic Alan Abbadessa-Green, one of the guys who worked on the 9/11 video. “Synchronicity serves as the compass; the treasure is finding the macrocosm in the microcosm and vice versa. As Above, So Below — and everything in between.”

Where we’re going, there are no roads! Or … something.

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The 2015 of "Back to the Future Part II" featured flying cars, hover boards, self-tieing sneakers and high-tech clothes. Here's how the movie compares to real life. (Jorge Ribas/The Washington Post)