Favorite movies are easy. But which wastes of celluloid stole your 8 bucks and precious minutes of your life? This isn't just for moderate disliking of a movie, but really gut-level "what the hell were they thinking?" kinds of loathing. Yes you can include those situations where you only saw part of the thing because you just had to walk out before all sense of good taste left your body.
I'll start it out with "Batman and Robin". And yes, I did manage to keep myself in my seat, thus revealing levels of internal fortitude heretofore unknown to myself.