Agree with these mentioned:
Silence of the Lambs
Braveheart
The Matrix
Godfather 1 & 2
Schindler's List
Pulp Fiction
Shawshank Redemption
Forest Gump
Others I haven't yet seen mentioned:
Breakfast at Tiffany's - the movie itself is a cultural icon, about a cultural icon, starring a cultural icon
Gone with the Wind - epicly epic of all epics, beautifully done
Office Space - one if the first slice of life movies to really nail it
Goldfinger - James Bond is a part of our culture, and this is one of the better
Vertigo or
Psycho or
Rear Window - Alfred Hitchcock is still THE master of the thriller, cannot be touched
Titanic - modern-day epic taking advantage of all modern tech had to offer
Blade Runner - genre busting and defining
Casablanca - just plain classic romance
Dr. Stranglove - Fantastic satire of international relations and hysteria
ET - children's movie standing the test of time
It's a Wonderful Life - best feel good movie ever
Unforgiven - modern western, deeply ... moving's not the right word - unsettling? stirring?
The Deerhunter - punch in the gut good
Rocky 1 - normal guy becomes everyman's hero
Ben Hur - historical epic - holy crap chariot scene with thousands of extras, worth watching just for this
To Kill a Mockingbird - beautiful movie adaptation of Harper Lee's perfect novel, with beloved Atticus Finch
j-e-f-f-e-r-s said:
Rebecca (Hitchcock at his creepiest)
Totally agree, but it's a lesser known, so I didn't mention it. Glad someone did.