You know, it wasn't the worst movie I've seen in a theater, but boy, The Blair Witch Project was the one that got me the most pissed.
Episode I made me feel the emptiest, for what it's worth. Psychologically staggered, I had to lean against my car in the parking lot afterwards. One of the people in the group asked me what was wrong. I waved him off, telling him he'd better get back to watching the dorks fighting with the toy lightsabers.*
*--None of this happened, but damnit, it could have.