The most horrible movie you've ever seen.

[Asila]

Ooooooh man. The movie that I really and truly violently hated the most and wished death upon as I walked out of the theater was Pan's Labyrinth. Yeah yeah, a lot of people loved that movie, and the fantasy bits of it were gorgeous. But the fact is that I shouldn't sob for 20 minutes at the end of a bloody fantasy movie. Fie upon you, unexpected drama!
My only other movie I can think of because I actually DID walk (drive?) out of it was that Exorcist prequel movie. I watched in at a drive-in as part of a 3-movie deal showing on Halloween; I was able to sit through AvP and left 30 minutes into the Exorcist thing. Man, it was bad.