10 Most Underrated Psychological Horror Movies

Based on a stage play of the same name, William Friedhkin’s 2006 psychological horror Bug is an intense Michael Shannon vehicle which will leave your skin crawling.

The Exorcist director is of course no stranger to horror, but this creepy realistic film couldn't be further from that earlier masterpiece's paranormal horror. The only horror here comes from the shattered mind of the film's main character, a severely disturbed man convinced his skin is crawling with bugs just beneath its surface.

Despite receiving critical adoration for its pair of superb central performances from Shannon and Ashley Judd, this one went largely unseen by horror film fans as few critics could find the right genre to describe it as. A blackly comic love story is one angle, as this pair of troubled heroes hole up in a hotel room and attempt to barricade the outside world from entry.

But psychological horror is what drives this unrelenting machine of a film, as the unfortunately very real condition of delusional parasitosis is brought to upsettingly visceral life in its gripping, gruesome runtime.