Some of my favorite movies...(omitting those already mentioned.)
Sunset Blvd. - I'm ready for my close up! Priceless!
Casablanca - They don't write 'em like this anymore.
The Blues Brothers - We're on a Mission from God.
2001 A Space Odyssey - Brilliant visual extravaganza...even if you aren't stoned.
Gone with the Wind - Probably the best ever.
Citizen Kane - Rosebud.
Wings - Silent film that will make you forget it's a silent film.
The Enemy Below - Great war movie.
Star Trek: The Wrath of Kahn - by itself it's enough to make a trekker out of almost anyone.
Lord of the Rings: Fellowship of the Ring - The books made fantasy a respectable medium, the movie is just as good.
Major Paine - Hilarious primer on child rearing. Ridding the closet of monsters is a riot!
Ladyhawke - Love conquers all.
Excalibur - Camelot, Arther, Lancelot, Love, Betrayal, Revival...a great story well told.
The Maltese Falcon - The definitive detective story.
Airplane! - I am serious, and don't call me Shirley.
Young Frankenstein - Mel Brooks at his best, same for Gene Wilder, Madeline Kahn, Marty Feldman, Teri Garr, Peter Boyle, etc.
The Good, the Bad and the Ugly - Spaghetti Westerns, gotta love 'em
The Green Berets - John Wayne, War movie. Need I say more?
The Ten Commandments - Epic on the grand scale.
I'll stop now before I get carried away.
Maybe I'll post my worst list later...it's much shorter