In 1991 Bret Easton Ellis published his controversial second novel, American Psycho, at age 26. After 53 trips back to press, it has sold more than a million copies in the U.S. and been published in numerous international editions. Despite a rapidly changing cultural landscape, American Psycho continues to be relevant—it was published by Vintage in e-book format last June and is currently being developed into a Broadway play. For a book that almost never was, who could have imagined two decades later that people would still be dressing up as the iconic antihero, Patrick Bateman, for Halloween? PW caught up with Ellis to talk about how this straight-to-paperback book stays eerily present 20 years after it was first released.