How the Grinch Stole Christmas. I only watched part of that because Mum switched channels during Mythbusters. Too much Jim Carrey playing the Mask.
I tend to avoid movies I suspect I won’t like. It has made sure I don’t go to the cinema very much.
Although I respect Ron Howard very much, I have not yet forgiven him for this travesty!
Our family rented that when it first came out on VHS. We must have had some moral objection to stopping a video. We all casually wander out of the room and let it play through.
My girlfriend and I suffered through A Clockwork Orange and then, after the end, both discovered that the other hated it and was only sitting through it for the sake of the other.
Pretty much the same thing happened when we rented Bubba Ho-Tep. As we discussed it during the credits, she said that she kept thinking, “somebody made this movie! On purpose!” which was, coincidentally, precisely what I had been thinking.
Coming from the guy who did American Graffiti, to boot. I share your disappointment.
[Nitpick]Great Expectations is by Dickens.[/Nitpick]
I walked out of an old Dyan Cannon movie, “Coast to Coast”, because it was unbelievably stupid.
I walked out of “The Mummy” 'cause I was predicting scenes long before they happened. About halfway through, I realized that I didn’t need to see this movie 'cause it was obvious that I’ve seen it before. 
I walked out of “Knocked Up” because of all the f-bombs that were being casually dropped. While there might be people who talk like that, it was the entire cast who talked like that. I think I left after the 56th “f***”.
Viva la Muerte. I won’t gross you out with the details.
That was pretty funny, especially that line about “The Money Pit”, the first movie I saw with my wife. (It was pretty horrible and I kept wondering what’s wrong with this girl because she kept laughing at this unbelievably lame comedy. But she was cute and we persevered… 
)
(Glad to see I’m not the only one who didn’t like Knocked Up.)
We walked out of Peter Jackson’s King Kong. We kept waiting and waiting and waiting for them to get to the goddamn island, and after an hour, we gave up and left. Later I rented it just to see the CGI dinosaurs, and it didn’t get a hell of a lot better after we left. I had read some good reviews, so I was very disappointed.
A long time ago a friend and I want to see Red Dawn (should have walked out), we were pissed at wasting our time with this movie that we decided to sneak into another movie- Sheena. We walked out of that one. As for actually wanting to see Red Dawn in the first place- we were high. By the time we got to Sheena we were no longer high.
Ditto on Knocked Up. I just couldn’t find it in me to sympathise with any of the characters after about half an hour. I decided that it would be better to turn off the TV and pretend that the ending involved a strategically placed explosive charge that killed everyone in that pathetic excuse for a comedy.
Marie Antoinette also didn’t last past the first 30 minutes. Kirsten Dunst’s wigs were doing a better job of emoting than she was. It just seemed like one big extended dressup-slumber-party at Versailles with vacuous people in pretty clothes. Yawn.
I can stomach anything in a movie - women being tortured to death, babies being raped and then ripped apart, Kevin Costner - but the only two movies I can remember walking out of in the theater were:
Ring 2. Never saw the first one, and was so bored stiff by the second one that I couldn’t take it. I hate J-horror - it’s fucking not scary and I don’t care what anyone says. Little girls with weird eyes are not scary. Little girls in any context whatsoever are not scary.
Man On Fire. I heard this was actually a pretty good movie, and that may well be, but my dad and I were really bored after like 30 minutes and we walked out. I heard that after that point, it actually got really good. I have no idea.
As for movies that I turned off, two stand out:
Stay. I had been given this movie for Christmas and heard that it was really great. My friends and I watched about 30 minutes of it and were so unbelievably bored that we had to turn it off and watch Are You Afraid Of The Dark bootleg DVDs.
David Lynch’s Dune. My friends and I are huge fans of everything that Lynch did, but this movie was too boring for them. I would have kept watching it, but they insisted on turning it off, and I was the odd man out, so it was turned off.
Another one hits the dust today - was watching The Brady Bunch Movie on TV and decided that I’d rather go to the shops instead after 30 minutes. Snooooze.
For the record I loved Knocked Up.
If it’s any consolation, there was also Roughnecks: The Starship Trooper Chronicles, a CGI animated show based (mix-and-match) on the book and movie. Aside from some cheesy looking character animation (let’s face it, it’s hard to make a person walk like they’re a person in CGI), the show was pretty danged good.
Most recently: Once
Unbelievable how favorably that movie was reviewed.
But, I’ve walked out of and turned off too many to remember.
Walked out on some Matt Damon cowboy movie. Me and my friends were doing the see-3-movies-for-the-price-of-one deal. That is, we pay for a movie, walk to another theatre when it’s over, repeat. We went to see some lame computer movie where Tim Robbins played Bill Gates instead.
Try these ones, if there’s one in your area.
I walked out of the theatre during the Mr. Bean movie and some film called the Englishman Who Went Up a Hill and Came Down a Mountain or some such twaddle.
I don’t go to the movies a lot, so I tend to be selective with what I decide to pony up eight bucks to see on the big screen. Ergo, my walk-outs are few and far between. The most recent was “Eight-Legged Freaks.” My date didn’t like it and I wasn’t too enamored by it myself, so we bailed after about thirty minutes of it.
My sister loaned me “Happy Gilmore”. She knows I’m a game show fan and she thought would like it because Bob Barker is in it (though his role in the movie, of course, had nothing to do with the Price is Right). I’m not an Adam Sandler fan by any stretch of the imagination, but I thought I’d give it a fair shot anyway. Nope, couldn’t make it past the halfway point. My sister meant well, of course.
Here’s a movie I would have walked out on if I could have justified the ten-mile-plus walk home that would have followed. When I was a kid my friend’s dad dropped us off at the cinema (only two screens at this venue, so not a lot to choose from in those days). For reasons that have since been forgotten, we decided to see “Haunted Honeymoon” (I don’t recall what the other choice was). Maybe we thought it would be scary. I don’t remember anything about this movie at all other than that it was one incredibly boring snooze-a-rama. Either they didn’t have any decent video games in the lobby, or there were no good stores close by, or I didn’t have any extra money, but if I could have thought of a good reason to leave the theater I would have. As I was squirming in my seat trying to stay awake I felt like a wolf with his foot stuck in a trap contemplating whether or not to chew it off just so he could escape. Seeing his dad come pick us up again was quite a welcome sight.
One of my faves. I actually bought the DVD. Granted it slows down a lot towards the end.