The Mafu Cage (1978)

The Mafu Cage (1978) 

aka

Deviation

Don't Ring the Doorbell

Der Mafu-Käfig

Two strange sisters live in a crumbling mansion, where they keep a pet ape, which belonged to their late father, locked in a cage. While one of the sisters seems to be keeping her head on straight, as it were, the other appears to be sinking further and further into barbarism and insanity.

(frankfob2 IMDB) 

Amoklauf (1994 Germany)

Amoklauf (1994 Germany) 

aka Run Amok

Excerpts of the life of a waiter who, living alone and isolated from the outside world developed an abysmal hatred of his fellow man. He finds himself quiz show after quiz show and then eventually brutal violence films that tame his desire to kill. But when his neighbour interupts him, he is freed from all inhibitions, and murderous campaign against everything that moves. (IMDB James Cameron)

Director Uwe Boll is most well-known for his mainstream horror crap-fests Alone In The Dark, House Of The Dead, and Blood Rayne. Amoklauf is an earlier film from the German director - and this film is NOTHING like his other watered-down Hollywood video-game inspired pieces of sh!t. Amoklauf is a dark and gritty look into a few days in the life of cold-hearted killer... (IMDB EVOL666) V&D

Nightcrawler (2014)

Nightcrawler (2014) 

When Lou Bloom, a driven man desperate for work, muscles into the world of L.A. crime journalism, he blurs the line between observer and participant to become the star of his own story. Aiding him in his effort is Nina, a TV-news veteran. (IMDB)