You want movies that are messed up and will probably make you cringe. Ok I got them for ya. But before I list these a mjority of these movies are no for the faint of heart and should be viewed with great discreation. Also Faces of Death is fake so bad its no even funny. Another note if you wanna know what these movies are about look them up on www.imdb.com
Salo: 120 Days of Sodom
A Living Hell
Antropophagus
The Beyond
Black Sun: The Nanking massacre
Blood Feast
Braindead <- not scary but funny as hell
Cannibal Holocaust
Daughter Of Darkness
Guinea Pig
Ichi The Killer
Irreversible
I Spit on Your Grave
Last House on the Left
Men Behind the Sun
Night Of The Demon
I got an entire list of messed up movies (Whether it be for horror reasons or not) that if you are interested in I can give you. Also to note these movies are mostly Exploitation so really really try and find uncut versions or else your missing out.
Riki-Oh: Story Of Ricky