There's nothing movie audiences love more than poking around in a character's brain, especially when said character is, well, not particularly well-adjusted. Since the birth of film, movies have been unpacking what makes people tick, using the psychological thriller genre -- which often verges on horror -- to delve into the inner workings of fascinating yet unsettling characters. Whether it's a serial killer, an abusive husband, or an obsessive housekeeper, these cinematic figures give our protagonists plenty to be dealing with as they unleash chaos on all who surround them. 

Dark, twisted, and often disturbing, the psychological thriller keeps audiences on the edge of their seats and constantly wrongfooted, as they attempt to parse the complexity of what they're seeing. This type of movie isn't the best choice to have playing on in the background while you're absentmindedly folding laundry or making dinner, but for the viewer who's willing to give it their full attention,...