Jaws is my biggest blind spot, I think. I also haven’t seen ET or Schindler’s List in full, but I’ve seen enough of each to have a sense of them.
Jerry Maguire might be #2. There’s plenty of popcorn movies I skip, but it seems like I’m the only person who didn’t watch that one.
I saw it when it was in the theater, almost 20 years ago, and while I liked it, I knew then that it could not be a classic because there are several cultural references in it that date it, big time.
Seconded. Also “Goodfellas”.
Saw the first one, hated it, skipped the rest.
I missed this one because it sounded awful to me, but then I saw “The Making of…” because my brother worked on it, and the FX looked great, so I watched the second half, where the ship sinks. I have seen the part from the iceberg hit to the point where the Carpathian comes into sight maybe three times now. I’ve never seen the first half. Some time, I might watch Gloria Stuart’s parts, though, because I liked the work she did in the 30s.
My son was born in 2006, and I’ve hardly been aware of movies since. I used to be a real cinephile, but aside from putting together a collection of files on a dedicated external HD of my favorite movies, I haven’t done much with films. I watch stuff on TCM, but new films I’ve seen lately tend to be of the Pixar variety, so I don’t even know what I’ve missed. I know I haven’t seen The Hurt Locker. I haven’t seen The Theory of Everything, and I want to, but I can barely name two movies made last year.
I wish I’d never seen Forrest Gump. In fact, I wish I’d never seen it twice.
Oh, yeah-- never seen The Godfather & sequels because I hate mob stuff. I’ve seen Goodfellas, but that’s a fluke.
Me, too. Haven’t seen any of them.
I’ve also never seen a Sylvester Stallone movie.
hahahahahahahaha!!!
I’ve only seen a little bit of The Lion King, Aladdin, and some other Disney movies. I’ve also only seen two out of the many Harry Potter movies.
Only seen a little bit of Lawrence of Arabia.
E.T.
Top Gun
Forrest Gump
Titanic
There are lots I haven’t seen, but these seem to be the most egregious to others.
Judging from the IMDB 250, Once Upon a Time in the West at #27. I’ve thought about it before, but it’s like 17 hours long.
I’ve seen a lot of films. Here are some I’ve never seen:
City of God (2002, Brazil/France, dir. Fernando Meirelles, Kátia Lund)
American History X (1998, U.S., dir. Tony Kaye)
The Intouchables (2011, France, dir. Olivier Nakache, Eric Toledano)
Toy Story 3 (2010, U.S., dir. Lee Unkrich)
The Best Years of Our Lives (1946, U.S., dir. William Wyler)
Brief Encounter (1945, U.K., dir. David Lean)
The Grapes of Wrath (1940, U.S., dir. John Ford)
Kind Hearts and Coronets (1949, U.K., dir. Robert Hamer)
L’Avventura (1960, Italy/France, dir. Michelangelo Antonioni)
The Man Who Shot Liberty Valence (1962, U.S., dir. John Ford)
Frozen (2013, U.S., dir. Chris Buck, Jennifer Lee)
Spider-Man (2002, U.S., dir. Sam Raimi)
The Incredibles (2004, U.S., dir. Brad Bird)
The Hobbit: An Unexpected Journey (2012, U.S./New Zealand, dir. Peter Jackson)
*E.T.
Avatar
Titanic
Battleship Potemkin
Princess Bride*
any Matrix movies past the first (which I really didn’t care for)
any Fast and Furious flicks (these are famous, I guess, but… seriously?)
Oooooh… I could name a lot more. I’m just a real stickler for movies I have an interest in and I tend to ignore all the rest. I just don’t want to be let down because I appreciate good film-making too much. Of course, the other side of that coin is: I’m probably missing out on some good ones, it’s just I hate the feeling of being let down by a film everyone else says is great and I find almost unwatchable.
C’est la vie.
PS: Two of those films: Battleship Potemkin and Princess Bride I think I would really like. I just haven’t gotten around to seeing them.
It’s a Wonderful Life. Seen parts of it on TV, but never bothered to watch the whole thing.
All the President’s Men. Never interested me.
Hmm. I’ve seen most of the movies in this thread.
For me it’s probably westerns. I’ve never been a western fan and I haven’t seen a lot of them. I’ve seen a few – High Noon, Magnificent Seven, Silverado (which I loved). But I haven’t seen
**Shane
Stagecoach
The Ox-Bow Incident
The Outlaw
My Darling Clementine
The Man Who Shot Liberty Valence
**
Most John Wayne movies, including True Grit.
My only comment on all that is that you HAVE TO, HAVE TO, HAVE TO see The Silence of the Lambs. It’s such a powerful film that I still get chills and goose bumps every time I see Sir Anthony Hopkins. Apparently Martha Stewart feels the same way!
I myself haven’t seen ET (though totally loved Close Encounters of the Third Kind), and just couldn’t watch Goodfellas because I saw My Cousin Vinny first and could not shake the notion that anything with Joe Pesci in it was supposed to be a comedy. 
Kramer vs. Kramer
The Princess Bride
Avatar
Any Pirates of Carribbean movies
Any Superhero movies
Any Matrix movies
Any Harry Potter movies
Any Vampire movies
Any Hobbit movies
Blackhawk Down. I was on active duty at the time and the whole situation pissed me off. I have since met several people who were there and my opinion has not changed.
Of the ones mention so far I’ve seen most except Schindler’s List. I guess its just too depressing and I haven’t gotten around to it. Not that I have anything against it.
Looking back at the list of recent Oscar winners I didn’t realize there were so many that didn’t interest me.
Birdman. I will see this eventually.
12 Years a Slave. Just haven’t gotten around to it.
Argo. I do want to see it but not that bad.
The Artist. No interest.
Slumdog Millionaire. No idea why I never watched it. I think I would enjoy it.
Crash. No interest
Million Dollar Baby. No interest. Already know the ending.
Chicago. I like musicals on stage not on film.
Shakespeare in Love. No interest.
I am a Western fan. I’m not going to try and convince you to change your preferences. But if you decide to see any of those I would pick The Man Who Shot Liberty Valence.
From those listed above:
Citizen Kane
E.T.
Gone With The Wind
It’s a Wonderful Life
Birth of a Nation
Avatar
Lawrence of Arabia
Casablanca
Titanic
Jerry Maguire
Shakespeare in Love
Million Dollar Baby
Slumdog Millionaire
The Artist
Argo
12 Years a Slave
Crash
Nearly anything by Hitchcock (though I am familiar with his most famous films simply by cultural exposure)
And I’ll add:
The Big Chill
The Exorcist
On the Waterfront
Some Like It Hot
Annie Hall
12 Angry Men
Gandhi
All Quiet On the Western Front
The King’s Speech
Terms of Endearment
From Here to Eternity
The Philadelphia Story
Wuthering Heights
The Color Purple
Good Will Hunting
The Maltese Falcon
Rebel Without A Cause
Midnight Cowboy
To Kill A Mockingbird
American Graffiti
Ben-Hur
Mr. Smith Goes to Washington
Butch Cassidy and the Sundance Kid
Treasure of the Sierra Madre
The Graduate
Network
The Pianist
Some of these I want to see someday. Others, not so much.
I’ve seen most of the movies above that involved guns, swords or explosions, but not the rest.
Famous movies I didn’t see listed which I haven’t seen:
Psycho
Back to the Future 2 & 3
Taxi Driver
Scarface
Raging Bull
Chinatown
There are all sorts of “classics” I’ve never seen, or have seen only part of.
I’ve never seen the following silent “masterpieces”:
Battleship Potemkin
Alexander Nevsky
Intolerance
Birth of a Nation
Metropolis
City Lights
The Kid
I’ve never seen a Fellini film or an Ingmar Bergman film in its entirety.