I've seen several publications do these lists, so I thought I'd throw in my two cents on the movies that make us proud to be part of the collective known as man kind...
Crime/mystery…
The Usual Suspects, The Godfather II, Casino, Goodfellas, Se7en, Snatch, Scarface
Action…
Blade, Die Hard, Road Warrior, Heat, 300, all three Bourne movies
War…
Apocalypse Now, Saving Private Ryan, Full Metal Jacket, Platoon, All Quiet on the Western Front (1933), Glory
Drama…
Schindler’s List, Das Boot, Crash, Say Anything, Gladiator, Stand By Me, Philadelphia, Finding Neverland
Sci-fi…
Aliens, original Star Wars Trilogy, Alien 3, Stargate
Horror…
The Exorcist, Texas Chainsaw Massacre, 28 Days Later, Wrong Turn, The Shining
Western…
Pale Rider, Tombstone, The Unforgiven
Foreign…
Zatoichi, Brotherhood of the Wolf, Crouching Tiger Hidden Dragon, Hero, Heaven and Earth, Yellow River
Comedy…
Young Frankenstein, History of the World, The Holy Grail, Kingpin
All of these movies represent those few moments when the stars and planets align to usher in something truly great. I've been witness to very few instances where perfection was achieved and these movies constitute the bulk of those experiences.
*Update...
Here's the Stupidly Forgotten list, movies I should have NEVER ommitted...
All three Lord of the Rings movies (thanks Waterboy), The Killing Fields, Fandango, The Departed, Clerks, A Clockwork Orange