A bad movie I recently saw was Wrath of the Titans.
But the really worst movie I've ever seen...I can't remember the title, but it was something about a circus clown and his daughter and two reporters, about mass murder and unfunny jokes. Oh, and there was a lot of fake blood. And the story did make no sense. The video quality was the worst, and I can't speak for the original version here, but the german dub was even worse than some of the german anime dubs made in the late 90s (and believe me, those were pretty bad at times). The only good thing about this movie was it's theme song. It played prior to the main film, and it got me really excited to see the movie. It lied to me.