m Punk trio Green Day popped up for an impromptu show in a New York subway station last week. Late-night host Jimmy Fallon joined them in the effort to draw attention to the "American Idiot" performers album and supporting tour. At the Rockefeller Center station, the band and Fallon wore costumes -- long-haired wigs, faux facial hair, sunglasses and beanies -- as seen in video shared on Reddit. As the crowd grew, Fallon, Billie Armstrong, Mike Dirnt and Tre Cool revealed themselves, launching into acoustic versions of Green Day hits "Basket Case," "American Idiot" and a single off their new album, "Look Ma, No Brains." Several New York police officers stood between the band and the crowd as onlookers pressed forward and sang along, their phones outstretched to capture the moment, according to video posted on X by hannahfeldman-- "i saw GreenDay tonight for $2.90," she tweeted, referring to the fare for a ride on the city's buses or trains.