The second Twilight film, New Moon. Dragged there by the girlfriend.
First film was awful and I didn't think it could be any worse, but New Moon was atrocious. The entire film was just that chick giving Jacob a serious case of blue balls. I was also dragged to see the third one which wasn't actually half as bad as I expected, had some decent action and a much better storyline.
PS I Love You is total dross. The Notebook is a movie I would recommend everybody watch...the last half hour of. It's the only film I've ever seen where everything that precedes the finale is largely pointless.