What film did you leave the theatre, or take back to the video store, before the credits started rolling?

Inspired by this question.

I very rarely discontinue watching a movie once I’ve started it, but I did walk out of The Da Vinci Code and looking back on it, I should have walked out of A Series of Unfortunate Events and Nights in Rodanthe. Or at least remembered to bring my handheld electronic Yahtzee.

1) Was there a movie that bored you to tears or was perhaps too grotesque for your taste or too stupid that made you get up and leave the theatre or push stop on your remote?

2) Have you ever watched a movie that generated tons of hype, but ended up disappointing you?

3) By preview and/or reviews, did you ever think a movie sounded horrible, but found yourself pleasantly surprised after watching it?

Do tell.