I've come up with my own movie spoofs as well as taken existing ones and modified them. Here are some:

Skeletor - This is madness. This is Sparta.
http://www.youtube.com/watch?v=w7amU8S4vJU

What if Obi-Wan had used Force Speed? With Wilhelm Scream.
http://www.youtube.com/watch?v=pWmObjrogMQ

Freddy Kreuger kills Harry Potter
http://www.youtube.com/watch?v=GwOOntzvU3E