http://www.imdb.com/list/ls062742985/

Black Moon (1975) and The Tin Drum (1979) are both excellent strange movies.

I would like to suggest adding the directors and/or year of films. It would be helpful to pinpoint the recommendations. Thanks!

Put rubbers lover, wedding trough and subconscious cruelty on your list!
Click here:
http://w11.zetaboards.com/horrormansion/index/

The one I was thinking about was
http://www.imdb.com/board/10062395/
But on further contemplation I don't know that it would fit the Avant-Garde description
Life is pleasant. Death is peaceful. It's the transition that's troublesome
Isaac Asimov

There's dozens of films called "The Trip", which one are you referring to?

The Trip,
The Bed Sitting Room,
No Blade of Grass,
The President's Analyst.
Zardoz
Life is pleasant. Death is peaceful. It's the transition that's troublesome
Isaac Asimov

Love Exposure
Din of Celestial Birds
Venom and Eternity
The Art of Vision
Modern Times Forever (Stora Enso Building, Helsinki)
Philosophy Of A Knife
Hurlements en faveur de Sade
Perles aux pourceaux.

Session 9
Evil Dead Trap
Tetsuo
Death Powder
Pinocchio 964

Seems like a great recommendation!
This world is a comedy to those that think, a tragedy to those that feel.

Possession [1981]
The Third Part Of The Night
Abre Los Ojos
INLAND EMPIRE
Stalker
Lets Scare Jessica To Death Tears Of Kali Girl Slaves Of Morgana Le Fay Performance If you keep an open mind, youll discover dark secrets.

Bunuel, Resnais, Lynch, Bergman.Good list!
Jodorowsky's films must be added too
The Holy Mountain (1973)
El Topo (1970)
Santa Sangre (1989)
I don't think Häxan is that strange but maybe you are thinking about the William S. Burroughs version? Speaking of Burroughs, Decoder (1984) must be mentioned. Awesome film! Liquid Sky (1982) is great too.
Antiparanoia is the eerie feeling that nothing is connected to anything else

i recently watches a czech movies called "Daisies" that was great.
"Antichrist" is great, but not obscure all of Lars Von Trier movies are great.
"Visitor Q" is odd
the new movie "Mother" from korea was kind of conventional but still very weird. maybe i just think any movie from asia is weird.
"House (hausu)" this is asian and CERTAINLY weird
"Gummo" is really good and so is "Julian Donkey Boy" by the same director.
"Southland Tales" by the director of "Donnie Darko" is great, not terrible as most people believe, lol
"Tromeo and Juliet" i haven't seen it yet, but yeah, its weird
well, those are just some that i could think of

i really need to see the drawing restraints, cremaster is pretty great. the one with the bedazzled saddle reminds me of the cohen brothers, haha.

Sorry, but no. I find them all interesting. Just look them all up and pick the ones that seem interesting to you.

i don't know if i'd consider gaspar noe's films obscure. he's among the top 3 (along with haneke and von trier) discussed european filmmakers of the past 5 years. also, i know peter greenaway's popularity has waned since the 90s, but i still wouldn't consider any of his films, in paritcular "the theif, the cook, his wife, and her lover" obscure.
however, hats off for giving "buddy boy," "next door," and "kontrol" their proper dues.

Wow, there are exactly 5 on the initial list that I had never heard of. EDIT: Well, 4 actually if youre referring to the mainstream film Blindness that came out a couple years ago.
Here are mine:
More Obscure
My 20th Century
Claire
Alberto Express
3 Lives and Only One Death (best Raoul Ruiz film IMO)
The American Astronaut
Avalon
Buddy Boy
Bad Ronald
Trouble Every Day
Visions Of Suffering
Cabaret Balkan
Calvaire
The Saddest Music In The World
Cowards Bend The Knee
Careful
Dracula: Pages of a Virgin's Diary
Clean, Shaven
The Cook, The Thief, His Wife, and Her Lover
Black Cat, White Cat
Death Bed: The Bed That Eats
The Piano Tuner Of Earthquakes
Blood Of A Poet
Fabled
Phase IV (yes, it was MST'd, but its actually good)
Genesis (short)
Grimm
964 Pinocchio
Hypothesis Of A Stolen Painting
Irreversible
I Stand Alone
Save The Green Planet!
Kissed
Kontroll
Leolo
Night Zoo
Le Proces
Love Is The Devil
Mad Cowgirl
The Man From Earth
Nói albínói
Next Door
The Red Dwarf (1998)
Nothing
The Passion Of Darkly Noon
The Reflecting Skin
Photographing Fairies
Pin
Of Freaks And Men
Prospero's Books
Les Revenants
A Snake Of June
Soft For Digging
Static
Suite 16
Suture
That Little Monster
Uzumaki
Go Go Second Time Virgin
Less Obscure
Begotten
Bad Boy Bubby
With A Friend Like Harry
Tetsuo
Seance On A Wet Afternoon
Onibaba
Woman In The Dunes
Living In Oblivion
Dust Devil
Eating Raoul
Eraserhead
The Fall
Santa Sangre
The Holy Mountain
El Topo
Fando y Lis
Viva la Muerte
I Will Walk Like A Crazy Horse
The Guernica Tree
Le Chute de la Maison Usher
City Of Lost Children
Delicatessen
Brain Dead
http://www.listology.com/profile_public.cfm/indv_id.12830/b_check_link _dest.True

Well, try getting
The Saragossa Manuscript
instead. Same director, not as radical, but wonderfully strange.
This world is a comedy to those that think, a tragedy to those that feel.

The Hour-Glass Sanatorium sounds interesting, but it's not on netflix. Damn.