The first two movies that popped into my head when I thought about "retro" movies have already been mentioned:
Soylent Green
Videodrome

Also, Wizard of Oz deserves at least an honorable mention.

I second this, along with anything directed by Mel Brooks.

Planet of the Apes (the original)

You see, I bet you're watching it incorrectly. You need to watch it, while listening to the commentary. Arnold sounds like he is stoned the whole time, and the commentary in general makes the movie hilariously awesome. Especially in a room full of good friends and beer.

That haven't been tried by title?

Metropolis.



Metaphysically possible to understand, physically impossible to watch. Doubly so with tinnitus...



Damn straight.

Nice, that movie had everyone in it. How about some; Bridge on the River Kwai, Zulu, Hell to Eternity, Heaven Knows Mr. Allison, Bataan, Seven Men from Now...etc.

Man, that freaking movie... It's one of those films that make me just want to punch things. It's great though

I'm going to recommend:

Rope
Rear Window... you know, pretty much everything by Alfred Hitchcock
The Warriors (1979)
All the classic Universal horror films. Dracula, Frankenstein, The Wolfman, The Mummy, etc.
Abyss (1989)
Beast Master. (Just pretend the sequels don't exist)
That's all I can think of at the moment.

Movies after the 90's, I would recommend Dead Man (1995) It's one of my favorite movies of all time.

Bladerunner
Alien
Alien 2
Predator
Conan the Barbarian
Highlander series
The Piano
Benhui
Dracula
Nosferatu

I don't really remember when they came out.

The Godfather

Who hasn't watched that yet? :facepalm:

I haven't. I only watched the first one several years ago