Blue
White
Red
All 3 movies in one sitting, in the above order.
It's such a trip!
Fear & Loathing in Las Vegas is probably one of my all time favorite movies & books.
Abso-fucking-lutly. Can't get enough of that movie.
I recommend Jacobs Ladder and maybe Requiem for a Dream.
Then one of the weirdest movies I've seen is Enter The Void.
http://www.imdb.com/title/tt1191111/
My friend put this on one night (Netflix, not sure if its still up) and his punk ass went to sleep leaving me to watch this fucked up movie throughout the night by myself. Its not scary per se. Its just really weird.
Beyond the Black Rainbow
Pretty weird movie, I still need to watch it again to really figure out what the fuck was going on, but the ending is definitely something you'd never expect.
The Man from the Earth (2007). Just watch it without checking any relative info or its trailer first ;]
Haha, I actually have a funny story with this movie. I was looking at imdb to help me pick a movie that night (I tend to check the genre, length and review score before I decide) and when I did, I somehow ended up putting this movie's bluray disc by mistake and started watching.
By the time I realized it was the wrong movie, I was already hooked by the story.
So basically, I watched it without any prior knowledge of it, as you said