[Pandajuice]

Pirates of the caribbean 2 is the only film I can remember shutting off in the middle. I've never walked out of the theatre and I always try to watch the entirety of a film, even if it's awful. But Pirates 2, I just couldn't take any more lameness and self-promotion and had to axe it after an hour or I'd have gone insane.
Transporter 2 was pretty bloody bad too and probably the most disappointing film I've seen because I loved the first one.