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.