requiem for a dream
american history x
their final scenes have haunted me for years.

2 years later and I'm still thinking of:
Brazil
Donnie Darko
Requiem for a Dream
Eternal Sunshine of the Spotless Mind
A Clockwork Orange
American Beauty
And lately I've found myself thinking of Departures a lot.

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in order
Brazil
Donnie Darko
Requiem for a Dream
Eternal Sunshine of the Spotless Mind
A Clockwork Orange
Life is Beautiful
The Butterfly Effect
Hero
Mean Creek
to a lesser effect
American History X
Mysterious Skin
Saw I
American Beauty
Children of Men

I would like to add
12 and holding
that movie was a bit haunting

WTF are people mentioning Juno?
The main film that really stuck in my head very strongly for a few weeks was Mulholland Dr. I'd say about every hour I would think of MD, and I was terrified of that movie. I couldn't even wash my hair in the shower because that movie haunted my mind whenever I closed my eyes. I don't know why it's so freaky to me- that movie is just brilliant, tragic, complex, and haunting. Plus I watched it alone.
It still freaks me out a little.

Legends of the Fall
House of Sand and Fog
Schindler's List
Saving Private Ryan
Requiem for a Dream
Basketball Diaries
The Departed
Irreversible
Mysterious Skin
In the Cut
Cause it's just not cool to be a Nazi anymore baby. - Half Nelson

Thanks to everyone that posted, you just gave me a very long list of must watch movies!
All of my tops have been listed except one: The Butterfly Effect
I know it doesn't compare to Mysterious Skin, Little Children, or Req for a Dream but after watching it I was haunted for days. All of these movies disturbed me. They all gave me such a profound feeling of how bad the world can be. Sadly, those seem to be the types of movies that stay in my head.

no order.
mysterious skin
Perfume: The Story of a Murderer
300
The Illusionist
Artificial Intelligence: AI

i stand alone
ichi the killer
year of the dog
gummo
lsd - the beyond within

Me too, patricialeat! The whole time I watched "Hard Candy," I thought, please please just let this be over soon. The acting was incredible but I felt physically ill afterwards. And it sort of makes you claustrophobic since the majority of the movie takes place in one location.

Thanks for mentioning "Hard Candy." I've never been so uncomfortable watching a movie. God, it was horrible, but in a good(ish). I'll never watch it again
but I can't stop thinking about it. INTENSE:
4.5 xanax out of 5

.
Before too long you'll be a memory.

Requiem for a Dream
Mysterious Skin
Atonement
Y Tu Mama Tambien
Bad Education
I would maybe count Irreversible, but that movie more or less disturbed me, with these I felt compelled to talk about them.
http://makinglovein2003.blogspot.com/
"Like a Whole Bucket of Stars Dumped into the Universe."

No Particular Order:
Mysterious Skin
No Country for Old Men
There Will Be Blood
Dog Day Afternoon
The Lookout
Candy
Requiem For A Dream
Life Is Beautiful
Brokeback Mountain
Juno
Monster's Ball
A Streetcar Named Desire
The Godfather Trilogy
I know that's way more than 5, but I watch a lot of movies.

In no particular order
Waking Life
What the Bleep do we know?
Bitter Moon
Cannibal Holocaust
Once
Bully
Paul Stanhope - Word of Mouth
American Pop
Hedwig and the Angry Inch
Inside I'm Dancing
That's just off the top of my head. I'm certain there are others I'm forgetting or that have already been listed.

The Book of Revelation
Gummo
Three Colours Blue
Somersault
2:37
The Rules of Attraction
Hard Candy
Disco Pigs

Ooh, I love making lists!!! Ones that I don't think have been mentioned yet:

1. Half Nelson
2. Swimming Pool
3. Millions
4. Hard Candy
5. Where the Day Takes You
   And I'd agree with those who mentioned: Mysterious Skin (this would be number one on my list), Secretary, The Ring, City of God, and Y Tu Mama Tambien

Christiane F is such a beautiful, sad, real movie. I love it.
It will always stay with me.
"Family" is just another word for "Censorship"

mysterious skin
todo sobre mi madre
WIT
Dot The I
London To Brighton
The Color Purple
And I'm going to watch Brick in 10 minutes, I hear thats a good one to stay on the mind.
London To Brighton as mentioned above is a particulary good film, I reccomend.

Taxi driver, mullholland drive, Antichrist, martyrs, irreversible.

im suprised no one had gone baby gone.

"I Spit On Your Grave" Disturbing movie, Bothered me for a long time after watching. Low budget, Sick, do not watch.

Waking Life
Momento
Jacob's Ladder
American Psycho
The Eye (Hong Kong)