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Improv Everywhere is a self-proclaimed New York City-based prank—wait! Stop! Don't leave just because you read the word "prank!" Just let us finish! We promise it's not what you think!

Improv Everywhere is a New York City-based prank collective that "causes scenes of chaos and joy in public places." And "prank" probably isn't the best way to describe them anyway: They're not punk teens pretending to stab each other and emotionally scarring strangers (which should be illegal and any teen who calls him or herself a "prankster" should be arrested preemptively.) 

In a series called "Movies in Real Life," Improv Everywhere recreates movies in real life. Above is their take on Harry Potter.

Watch their recreation of When Harry Met Sally's diner scene, to see what happens when 20 women fake an orgasm in the same restaurant:

Watch Rocky, for the flash mob of children and Philly pride:

Watch Jurassic Park all the way to the end for a delightful dino surprise:

Watch The Matrix to watch a bunch of people fight in slow motion in real time:

Watch Back to the Future because it's always funny when someone yells "MAAARTAAAY":

Watch Indiana Jones because it is simply brilliant in its stupidity:

A person dressed as a boulder chasing a person dressed as Indy is never not funny.

And watch for the people's reactions. Happiness. YouTube "pranksters," take note.

Improv Everywhere releases a new "Movies in Real Life" every Tuesday.