"Not many psychological thrillers could be described as 'light,' because films taking such an approach might well be missing the point. Psychological movies need to get into the heads of various characters, for better or worse, and thrillers – on account of them having to, you know, thrill – will frequently get into the minds of characters who are either troubled or immeasurably stressed… or maybe even a bit of both. So, for those psychological thrillers that go the extra step in feeling dark, here are some that are all compelling, but don't exactly make for the easiest of viewing experiences. Those who want things dark, intense, and possibly even existentially despairing might want to check the following out, as some of them more than earn the right to be called the darkest psychological thriller movies of all time." - collider.com
