Intelligence in a film...

"What can be said is that the three actors inhabit this material with ease and gratitude: It is good to act on a simmer sometimes, instead of at a fast boil. It's unusual to find an American movie that takes its time. It's remarkable to listen to dialogue that assumes the audience is well-read. It is refreshing to hear literate conversation."

An excerpt from Roger Ebert's review of the film. I agree that it is so enjoyable to listen to genuinely intelligent characters. What other movies share this same quality, by "assuming the audience is well-read?" As a literature fiend, I'm always looking for good literary films. Any suggestions are appreciated!