I'd say Requiem for a Dream that movie scared me straight out of using any hard drugs. Also, the directing and score are nearly perfect in my opinion. Best use of split screens (not sure if that's the correct terminology) I've ever seen in a movie.

American Beauty. It's just a brilliant film. That movie made me fall in love with Kevin Spacey and the song "The Seeker."

American Psycho- This movie is hysterical and I think has a very good point to make about todays materialistic society. "I JUST WANT TO FIT IN!" Yeah. Although I think it would have been a funny enough movie if he didn't start killing people.

One Flew Over the ...well shizzle forgot how they spelt coocoo... cucoo... well wahtever.. NEST. What I got out of this movie was that excepted medical use at the time isn't always right (mainly thinking about anti-depressants).