Looking for movies focusing mainly on one person
 

Hi,

I'm looking for movies in the vain of The Ninth Gate, In The Mouth Of Madness, The Midnight Meat Train,... Maybe The Mothman Prophecies and I Saw The Devil.
Themes like the supernatural, madness, insanity and maybe a touch of violence.
I've seen a bunch of movies but I'm sure there are a some I overlooked.

Thanks!

Repulsion
Jacob's Ladder

will post more later.

Diary of a Madman.
Repulsion

Carnival of Souls

the Machinist

Romero has a few films that might qualify, movies centering on guys losing their minds. Take a look at Martin, Bruiser, The Dark Half, Monkey Shines.

Also take a look at Videodrome

Clockwork Orange.

not horror but from what I understand the new Robert Redford movie " All Is Lost" is just him in a boat lost at sea. Getting good reviews.

Henry,portrait of a serial killer.