What are your favorite screenplays?

For me,

Network - The monologues are unreal. It really predicted the future.
Sunset Boulevard - A similar kind of satire, attacking celebrity culture and Hollywood. Sharp, funny, depressing, always witty, and each character serving a common theme.
Harakiri - The non-linear storytelling is constantly compelling, with characters being revealed through action. Just amazing.
12 Angry Men - The way it's constantly enthralling even in just one room. Truly a remarkable feat.
Sweet Smell of Success - The table scene. Need I say more? The dialogue is just so delicious.
There Will Be Blood - Milkshake.

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