Great Question. Let me see... hmmmmmm. How about....Requiem for a Dream

Maybe Southland Tales. I actually wound up not liking that one cuz I didn't get it.

Pi. Great movie. On the cheesier side there's always: The 13th Floor, Existenz, The Fountain, Fight Club, The Matrix Trilogy, etc.

There is a movie called Trauma that makes you question what was really real it has Colin Firth in it....and it has mixed reviews.....but if you are looking for something like that i definitely think it fits the category

If your looking for a complete visually weird movie, mirror mask is kinda odd most similar to the labyrinth but a good difference Also the cell with jennifer lopez....not well received but im not sure if that is just because she is not believable for a sci-fi role or what....i thought it to be interesting because it makes it capable to enter someone else's dreams

Oh also the nines with Ryan Reynolds is a bit of a trip film and thr3e if you want more of a murder movie trying to give you choices that you may have not seen...not too mainstream

Check out "The Life of David Gale". It's really good.

Did you ever see 12 Monkeys? I loved that one.

http://www.videovista.net/articles/weirdmovies.html found this site of 10 movies, most i haven't seen but i recognize some good titles so maybe the others are good too.

Phase IV Andromeda Strain Circle of Iron Jumper The Time Machine The Gods Must be Crazy

Where is your god now?

i liked buterfly affect and Stay wasnt too bad either. Waking life is a really good mind bender, hard to top that one

Great question! I'm kind of a connoisseur of trip balls movies... The Cube anything David Lynch... namely Blue Velvet, Mulholland Drive The Machinist The Nines 200 Motels Fantastic Planet The Beach The Wall anything stanley Kubrick The Manchurian Candidate some more obvious ones... Fear & Loathing, The Matrix, Donnie Darko, AMerican Psycho

Magnolia The Life Before Her Eyes The Truman Show Eternal Sunshine of the Spotless Mind I'll come back when I think of more

Try Jean-Luc Godard's Alphaville http://en.wikipedia.org/wiki/Alphaville_(film)

Naked Lunch, Jaccob's Ladder, Hobb's End, Eraserhead, The Usual Suspects and Lost Highway come to mind.

have you seen "survive" The story of the soccer team whos plane crashes in the Andes Mts. In the dead of winter, And they turn to Cannabalism to survive. true story, very good.

"Fight Club" Starring: Edward Norton & Brad Pitt. It's my favourite movie of all time as well as being mind boggling!

The Illusionist, What Dreams may Come is a really good one for questioning reality, Logan's Run,

The Butterfly Effect did that for me.

Natural Born Killers was pretty trippy Sin City was weird too

Blade Runner with Harrison Ford, and Hitcher. It may sound corny but how about Mission to Mars. You need to see this one on a big screen and in the dark to give you the eerie effect of floating in space as you're looking down at Mars. It also adds a weird twist as to how mankind was created.

Pulp Fiction, Reservoir Dogs

Have you seen any of the old "Twilight Zone" TV episodes (half hour, black and white)?

I thought "Big Fish" was trippy and an excellent film.

off the top of my head... . . . 12 monkeys the abyss (director's cut) adaptation altered states american beauty american history x american psycho apocalypse now the beach a beautifful mind being john malkovich blow the boondock saints a bronx tale the butterfly effect the cell city of god a clockwork orange confidence eagle eye fantastic planetfelon fight club first blood gangs of new york the green mile i heart huckabees i, robot the illusionist the island john rambo (aka rambo 4) k-pax kingdom of heaven kung fu panda l.a. confidential the life of david gale lock, stock, and two smoking barrels lucky number slevin master and commander: the far side of the world the matrix the matrix reloaded michael clayton moulin rouge natural born killers the neverending story new jack city ninja scroll operation: swordfish pay it forward poolhall junkies point break the point the prestige pulp fiction reign the conqueror (tv mini-series) requiem for a dream (director's cut) reservoir dogs rounders the salton sea a scanner darkly secretary se7en shade the shawshank redemption shooter sin city the sixth sense slc punk snatch star trek - insurrection star wars 3-6, plus the podracing portion of 1 stargate the sting training day the usual suspects titan a.e. (but only the first 10 minutes or so) total recall traffic v for vendetta vanilla sky (the original is the best, i've been told) vantage point the wall war (aka rogue) what dreams may come wild things zoolander

This is trippy. Try "1408". It's about a man who goes into a hotel room...and never gets out. Ooops, I gave away the plot.