When Marty McFly first steps out into the year 2015 in Back to the Future Part II, he's nearly swallowed whole by a massive holographic great white shark promoting Jaws 19. It was a hilarious nod to Hollywood’s love for sequels—and a jab at the Jaws franchise, which had already produced four films by the time the movie was released in 1989. Fast forward to October 21, 2015—Back to the Future Day, the exact date Marty and Doc traveled to the future. To celebrate the film’s 30th anniversary, Unive