Someone's Knocking at the Door2009

Horror Vault's take

A group of medical students find themselves hunted on their own campus by a pair of sadistic killers whose methods are as depraved as they are bizarre. Rooted in a dark chapter from the school's experimental past, the terror feels deeply personal — and inescapable. Equal parts midnight-movie gross-out and pitch-black satire, this low-budget provocation gleefully ignores the rules of conventional horror. It's not for the faint of heart, and it knows it.

Content: Graphic Sexual Violence, Extreme Gore, Drug Use, Disturbing And Degrading Sexual Content, Blackface Imagery