The weirdest are Tetsuo the Iron Man and sequel Tetsuo II Body Hammer - (man turns into metal monster)
Altered States - (weird scifi)
Death in the Seine - (showing number of stories (+nude bodies) about drowings by Peter Greenaway)
Donnie Darko - (teenager with visions of large rabbit)
Eraserhead (David Lynches movie about unbearable monster kid)
Evil Dead 1 & 2 (Sam Raimi's movies about demons haunting people)
In the Mouth of the Madness - (John Carpenter, Writer of the mad stories)
Innocence - (boarding school in a walled garden, girls delivered in coffins)
Jabberwock (Monty Python comedy about monster)
Kin-Dza-Dza - (russian scifi classic)
The Last Wave - (aboriginal story about wave that's going to destroy)
Lune Froide - (Two drunkards find drowned young woman from the beach and take her to bed)
Nightbreed - (monsters living among us)
Nightflyers - (strange spaceship)
The Reflecting Skin - (Viggo Mortensen, young boy in rural area)
Repo - The Genetic Opera - (Repo men are after your organs)
Seksmisja - (two men are taken into city ruled by women)
Serial Lover - (french comedy about woman whose lovers die in comical ways)
Solaris - (scifi classic about sentient planet)
Southern Comfort - (sequel to Ogginoggen, young girl, weird adventure)
Tron - (people drawn into game's world)
Tykho Moon - (based on Enki Bilal's comics)
Twin Peaks - (yeah, there's short movie version too, paranormal murder story)
Who Can Kill a Child - (group of adults vs horde of murdering children)
Oh, I accidently sent this before I was finished. Editing it more...