Glengarry Glen Ross (1992)

Suspenseful up until the last moment, flawless and well-paced character development (of course the movie is character-driven, but with a lot of characters, it was expected to be difficult to introduce and get to know everyone properly — this movie did it masterfully though), and a shocking plot twist. Another note, the famous “always be closing” speech was as epic in the movie as it was on its own.