Watch: Identical Twins Pull Elaborate Time-Travel Prank on NYC Subway

NEW YORK CITY, NY — On a magnificent day earlier this March on the isle of Manhattan, in their third project re-purposing multiple sets of identical twins as freaky public art installations, the Improv Everywhere troupe sent four twin sets, or eight actors total, onto the N Train, with the mission of scaring passengers into thinking one set of twins had time-traveled back from the future to warn the other set against it.

As far as we can tell, no one in the subway car was ever 100 percent convinced they were seeing sci-fi come to life.

But there did appear to be moments of incredulity, and many of laughter. So if nothing else, let us rejoice in the fact that the cold, hard, Queens-bound N Train heard an unfamiliar sound that day: the sound of human happiness.

Previously in Improv Everywhere twin art: "Human Mirror" on the northbound 6 Train and "Back To The Future in Real Life" at the Met Life Clock Tower.