This is a topic that came up in the comments thread here. Rather than add my own contribution to what was — let's be honest — a thread hijack, I'm starting a new thread.
For reasons I can no longer recall, I walked out on the 1968 movie "Petulia." Trailer:
The walk-out took place circa 1970, and I just wasn't in the mood for that sort of thing. I can't remember why. Oddly, I stopped walking out on movies, so for many years, this was the only movie I'd ever walked out on. I was giving everything a chance, or maybe I felt like I was wasting money if I didn't consume the whole bad/boring/pointless thing. And I must have averaged a movie a week for the next 30 years.
Then in 1998, I went to see "Antz" — a computer-animated movie voiced by Woody Allen, Sharon Stone, and others. The giant closeups of the ant faces were literally making me ill — even angry. I walked out, and I have never viewed another computer-animated movie, even on TV. Channel-surfing, I've occasionally glanced at a few minutes of some highly praised thing like "Finding Nemo" or "Shrek," but it has only reconfirmed my visceral hatred of the medium (which extends to live-actor movies with a lot of CGI).
The other movie I walked out on was Spike Lee's "Summer of Sam." This was 1 year after I walked out on "Antz." I was watching an opening sequence with a couple of ordinary people in a car, and I knew the story was that they were going to be murdered. I didn't want to sit there and watch. I'd paid good money to watch a movie I thought was going to be good and to my taste, but I suddenly felt that I didn't want to be subjected to it, and without wasting any time thinking about it — I had to decide quickly or I'd see the murder — I got right up and left.
I kept going to movies in 1999, which turned out to be one of my all-time favorite years: "The Matrix," "Being John Malkovich," "Fight Club," "Man on the Moon," "Election." I thought we were entering a golden age. But the next year seemed entirely different to me. Was CGI leaking into everything, making me sick? That was the year of "Gladiator" and "The Perfect Storm" (which I avoided). I saw some things that were praised that I hated, like "Traffic" — which I didn't walk out on. After that, I became a lot more selective, and I haven't had to walk out on things. In fact, I force myself to go through with the experience once I've selected a movie. For example, this past year, I saw "Into the Wild" and "Across the Universe." (I'm a sucker, apparently, for titles that begin with a preposition and end with "the [something vast].") With both of them, I had to struggle not to give in to my urge to escape, and there were some good things I would have missed if I'd indulged my ever-present desire for flight.
What have you walked out on? When did you conquer a strong urge to flee and did you regret your submission? Oh, I'm only talking about movies, you know. Unless you want to hijack this thread too.