According to a recent poll*, the worst words to use in a movie title included: cop, future, karate, ninja, robot, cyborg, beast, Bruce, darkness, and cyber.
From this I deduce the worst movie title possible would be:
Bruce Future and the Cyborg Karate Cops Versus the Ninja Robot Cyberbeasts of the Outer Darkness.
I have this sneaky feeling that someone, somewhere, is already trying to get this funded. Worse, there are people who will feel compelled to watch it if it gets made.
* No idea where but I think I really saw it somewhere a few years ago.