It's Patrick Bateman come to life. This guy has been freaking out parade viewers with his American Psycho costume (and creepy homicidal facial expressions) for the last few years. The photo above is from the 2010 Village Halloween Parade, but we fondly remember our first American Psycho sighting in 2006.
Want to try your own take? You need a Wall Street suit, a deadly weapon (chainsaw would be a nice touch), lots of blood, and a cold, sociopathic stare.