Ok, I have seen the vast majority of the ones quoted here, some comments
Branded to Kill: awesome film, preffer Tokyo Nagaremono (just check my screen name)
Two Lane Blacktop: sorry to disapont, own it on Criterion edition
Being There, Peter Sellers at its best,
Network: paddy Chayefsky is GOD
The Big Red One: Sam Fuller, mandatory viewing. I still preffer Shock Corridor, though
STALKER: Huge Tarkovsky fan
Dead Snow: it was rubbish
The Happiness Of The Katakuris, I'm a huge, HUGE fan of Takashi Miike, I reccomend watching
the korean original Chyonghan kajok
Violent Shit 3: Infantry of Doom. Andreas Schnaas is a jackass, that movie bored the hell out of me
Wild zero: own it on DVD, own Guitar Wolf's discography
Versus: same thing, even have the limited edition tin box.
El Topo, have an autographed copy
Robo Geisha, it was even worst than both Tokyo Gore Police and The Machine Girl (and THAT is saying something...)
Murder by Deat: It has the only film acting appearance of Truman Capote, so, it is a curious gem just because of that
Ice Pirates, it has Anjelica Houston, Robert Urich, Ron PErlman and John "I'm the lousiest films ever shot" Carradine, mandatory viewing if you enjoy crap cinema
Gummo, love that one, Harmony Korine is wonderful
Tetsuo: also a huge Shinya Tsukamoto fan, I recommend Tokyo Ken. Just as a piece of trivia, Tsukamoto, the director, provided Vamp's voice in the Japanese version of MGS4
Jade Warrior: that's the finnish martial arts movie, right? bored the hell out of me, didn't finish watching it.
Ok, I have some
Satantango by Bela Tarr, a seven and a half hour movie about a small town in Hungary
the Cremaster Cycle by Matthew Barney, in which a lot of crazy shit happens, and has Dave Lombardo and the singer from Morbid Angel (the latter covered in bees) in an explosive cameo
Knights by Albert Pyun: Kris Kristofferson (well, to be fair, is Kris Kristofferson's double) fighting cyborg vampires
The Beast of Yucca Flats by Coleman Francis: I know many, many people know it, but very few have dared to se it in one sitting.
Stone Reader by Dow Mossman: a documentary about books and reading, yeah, that one IS obscure...
Madam Sata by Karim Ainouz: a brazilian bio pic about a gay, crossdressing con man and capoeira master