The Room (2003)
This is quite possibly the worst movie I've ever seen, but that's a very good thing. Like
Troll 2, it's an absolute riot; what was supposed to be a very serious drama is now an instant cult classic, thanks to the tragically bad acting of director Tommy Wiseau.
I urge you all to check this clip out:
http://www.youtube.com/watch?v=ISXiFJS9D5A