Forgot one and no one else mentioned it. It would be real close to the top of my list:

Blade Runner

I think I have a new hero!  This movie was way ahead of it's time in technology.  I watched this again just last week.  I think it came out in 81-82 maybe?

Saving Private Ryan

A Christmas Story

Raiders of the Lost Ark

Quigley Down Under

Crocodile Dundee (both)

The Godfather I

Grapes of Wrath

African Queen

Easy Rider

many many more

My absolute favorite is "Smokey and The Bandit."  Before the cable B******* took CMT off of basic cable, I would watch it about 2 times a month.  

"Animal House" is a great one.  Funnier than heck.  Not that I was old enough to see it, but my parents were sick of quoting it, and my sister and I not knowing what they were talking about, so they broke down and showed it to us 2 summers ago.  Plus, I have always been a little ahead of the loop in responsibility, and maturity, (others have said it - not me) so that was a factor too.

"Delta Farce," and "Health Inspector" were hilarious too.  

We really don't watch that many movies at my house.  Just comes down to a lack of free time.  Plus, even when we do, we wait until it comes to VHS, or DVD.  I can count the number of times I have been to a theater on one hand.

Animal House

The Green Mile

Smokey and The Bandit

Blazing Saddles

Ruthless People

Saving Private Ryan

the departed (drama/action)

wedding crashers (comedy)

the good the bad and the ugly (western/older)