The worst movie I have ever seen was "The Last Days of Planet Earth." I barely remember it, but know it had giant mutant slugs and had something to do with Nostrodamas. It was put out by TOHO who put out Godzilla (the original. Not that CG wuss) so you'd think it'd be a classic, but no. A friend and I rented it specifically for purposes of mocking it, and 10 minutes in it was so awful we gave up. Of course, I've never actually seen all of "Manos: The Hands of Fate" which is widely regarded as the worst "mainstream" movie ever made. Someday.......
What is the best movie you've ever seen and why?