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I haven't ever walked out of a movie I specifically paid for. I have ditched on movies at film festivals, where I had an all access pass to see any and every movie. In some of those festivals, especially the Portland International Film Festival I used to attend every year (when I still lived in PDX), I could see upwards of fifty movies over the few weeks of the run. In that situation there are many movies starting at staggered times and all in proximity to each other. A handful of times I would start one knowing that if it didn't immediately grip me I had backup options that I could eject myself for.
The only one of those I felt a little bad about was a Mexican film, the title of which I have long forgotten, because the film's director was sitting two seats away from me. When I got up and bolted half an hour in I had to go right past him. Oh, well.
But if I pay for it, no matter how terrible it is, I'll stick it out. I have let myself fall asleep in a couple because I was bored, stopped fighting the urge to doze, but I haven't ever gotten up and left.
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"Film is a disease. When it infects your bloodstream it takes over as the number one hormone. It bosses the enzymes, directs the pineal gland, plays Iago to your psyche. As with heroin, the antidote to Film is more Film." - Frank Capra