A big second to Sweet Smell of Success, an often overlooked gem of noirish coolness. Other favorites include Sunset Boulevard and Dial ‘M’ for Murder.
What? No mentions of “Double Indemnity”,the original and still the best version of"D.O.A", or of “Rear Window” yet?
It was mentioned in another thread – The Lion in Winter. I saw this for the first time several weeks ago and was enthralled the entire time!
Other oldie favorites (some of which have already been mentioned:
Singin’ in the Rain (own it);
North by Northwest (oh hell, can we just go ahead and say “anything with Cary Grant”??)
Strangers on a Train
Rear Window (talk about clothes and hairstyles! I wanna be Grace Kelly!)
So many that have already been mentioned, plus a few that haven’t (I think):
Foreign Correspondent
Shadow of a Doubt
My Man Godfrey
Miracle of Morgan’s Creek
Mr. Blandings Builds His Dream House
It Happened One Night, from 1934 and starring Clark Gable and Claudette Colbert, is great fun to watch. I suppose it’s a romcom, but it sure doesn’t feel like it.
I’m not the OP, but some of us crumb bums don’t get TCM. I do get MoviePlex, RetroPlex, and a channel what only shows Westerns. So’s maybe I ain’t such a crumb bum after all! 
VCNJ~
Looking through this thread, many of mine were mentioned.
Father Goose
Operation Petticoat
Casablanca
Singin’ in the Rain
Duck Soup
The Wizard of Oz
Miracle on 34th Street
The Maltese Falcon
The Thin Man
Splendor in the Grass
The Court Jester
The Quiet Man
Sullivan’s Travels
To Kill a Mockingbird
The Birds
Frankenstein
Dracula
Desk Set
Bell Book and Candle
Breakfast at Tiffanys
Sabrina
Roman Holiday
Inherit The Wind
Fail Safe
Doctor Strangelove; or How I Learned To Stop Worrying And Love The Bomb
12 Angry Men
The Caine Mutiny
The African Queen
Arsenic and Old Lace
The Quiet Man
Guess Who’s Coming to Dinner
The Lion in Winter
My Man Godfrey
I will add:
The Philadelphia Story (1940)
Bringing Up Baby (1938)
Woman of the Year (1942)
Adam’s Rib (1949)
It’s a Mad Mad Mad Mad World (1963)
Inherit the Wind (1960)
The Clock (1945)
Meet Me in St. Louis (1944)
Funny Face (1957)
West Side Story (1961)
On the Town (1949)
The Longest Day (1962)
Darby O’Gill and the Little People (1959)
Mister Roberts (1955)
The Grapes of Wrath (1940)
Harvey (1950)
Rear Window (1954)
Mr. Smith Goes to Washington (1939)
Buck Privates (1941)
Bud Abbott Lou Costello Meet Frankenstein (1948)
The Pride of the Yankees (1942) (of course)
Sergeant York (1941)
The Day the Earth Stood Still (1951)
Citizen Kane (1941)
Bambi (1942)
Fantasia (1940)
The Adventures of Robin Hood (1938)
Duck Soup (1933)
King Kong (1933)
A Night at the Opera (1935)
I know I am forgetting many, but a good list so far.
Jim
City Lights
Modern Times
The Great Dictator
I can’t believe no one’s mentioned John Ford’s The Quiet Man!
The Quiet Man is in post #5 and #27.
I was listing the ones I saw that I agreed with. I was not adding those as new. I did not catch the fact that two posters listed this movie I loved.
I could see bothering to mention a double if I added a new one that was already posted, but why did you bother to point out the Quiet Man was listed twice?
Jim
I have a film library of more than 1000 titles here with me. I could not even begin to tell you.
Oh, but the wife is partial to “It’s a Wonderful Life.”
I’m glad to see “The Passion of Joan of Arc” and “The General” mentioned above. Otherwise, not many silent features named here. Speaking of “The General,” I think I have all of Buster Keaton’s full-length features and several of his shorts. (No, not his underwear.) He was fantatstic. Sad to see him have to resort to those television commercials in the 1960s. Does anyone remember his cameo appearance in “Sunset Boulevard”?
And witten by Ray Bradbury!
Mine are all the Parmount Marxes, but especially the last three, Night at the Opera, Citizen Kane, King King, and, a new one Hellzapoppin’. I hadn’t seen it for 40 years, but it was far funnier than my childhood memories.
Bringing up Baby
Some Like it Hot hasn’t shown up - but nobody’s perfect.
Post #6 above. **ArchiveGuy ** mentioned it.
Because I thought it was funny, hence the smiley.
No big deal, it’s one of my favorite movies.
A few I haven’t seen mentioned yet, with brief descriptions for those who might not be familiar with them:
***The Shop Around the Corner ** * - I love Jimmy Stewart and this is a charming movie. All of the actors do a great job inhabiting their characters. (It was the inspiration for You’ve Got Mail, but I like this better.)
The Night of the Iguana - a Tennessee Williams adaptation with Richard Burton, Ava Gardner, Deborah Kerr. The tension and passion in this movie are almost tangible. A really great movie.
Friendly Persuasion - Gary Cooper as the father of a Quaker family during the Civil War. A good story with some light moments, but with a serious (and timeless) question at its core.
Bells Are Ringing - A fun musical romantic comedy with Judy Holliday and Dean Martin. I haven’t seen it in ages, but I remember really liking it.
The Day the Earth Stood Still
Forbidden Planet
The War of the Worlds
The Birds
Fantasia
The Killers
The Manchurian Candidate
Most of my other favs have been mentioned it looks like.
I have a buddy who thought that old movies all sucked. He saw The Treasure of the Sierra Madre at my house one day and was amazed that it was (a) old, and (b) didn’t suck. North By Northwest was on a few days later and he liked it, too. I ought to email him the list from this thread.