August Underground

Imagine walking down the street and finding an unmarked VHS tape. Curiosity piqued, you take it home and pop it in. What starts off as two men screwing around with a video camera quickly transforms into an ultra-realistic torture sequence where the unidentified psychopaths tape their exploits as they torment and violate a woman tied to a chair.
The sickest film ever made
The August Underground film series is a collection of films acting as a documentary following a couple of serial killers as they go out killing.