Requiem For A Dream is quite possibly the most brilliant movie ever made. Based on the 1978 novel by Hubert Selby. I'm in no way belittling the book, as it was also wonderfully done, but this is the only movie I've ever seen that bested the novel before it.
The film depicts different forms of addiction, leading to the characters' imprisonment in a dream world of delusion and reckless desperation, which is then overtaken and devastated by reality.
Starring: Ellen Burstyn, Jared Leto, Jennifer Connelly, and Marlon Wayans. Burstyn was nominated for an Academy Award for Best Actress in 2000 for her role.
Go see Requiem For A Dream you degerates.