What is the worst movie you have ever seen? I’m hoping there will be a lot of varying answers here. Mine is either Wing Commander or Army of Darkness.
“War doesn’t determine who’s right. It determines who’s left.”
Even though Army of Darkness reeked, you gotta admit that the scene with the tree screwing that girl was pretty cool. 
The worst movie I ever saw had to be Monty Python’s And Now For Something Completly Different. It was sooooo dull, I kept falling asleep.
The mass of men lead lives of quiet desperation.
– Henry David Thoreau
“Army of Darkness”? C’mon! It’s not great, but at least it’s fun.
I’ll leave out all the MST3K movies in my collection (though Red Zone Cuba is pretty awful).
I have to go with the ol’ stand-by and say Plan 9 from Outer Space.
The only movie I’ve seen in the theater that was bad enough to make me walk out was Color of Night with Bruce Willis and Jane March.
“The day after tomorrow is the third day of the rest of your life.” -George Carlin
“Wired” - the movie supposedly about the life of John Belushi. This movie is so astonishingly bad, it made me angry instead of amused. The made up scenes of skits on SNL were so bad, the paid extras in the “audience” didn’t even laugh. Please don’t rent this movie to see if I’m right - the cretins who made it don’t deserve to make any money from this piece of trash.
Cessandra - you’re a loony.
Cessandra, I hope that’s not the only Monty Python movie you’ve ever seen. The others are hilarious, especially Monty Python and the Quest for the Holy Grail. Just know that you will learn several things about swallows from this movie. 
“War doesn’t determine who’s right. It determines who’s left.”
I once did a survey of people I was in email contact with for the best movie. There was no great consensus, but more people put Star Wars on the top ten than any other single movie (though nobody put it number one, oddly). Anyway, I tried to follow it up with a worst movie poll. There were so many movies named that no consensus AT ALL could be found. The names Ed Wood and Russ Meyers figured prominently, though.
I’m a big fan of Michael Moore’s, but I have to cast my vote for Canadian Bacon. Absolutely awful on every level.
Really bad movie of all time? Okay, “Plan 9…” got the turkey award and a cult following. Granted.
From the same period my vote goes to “Robot Monster.”
I want to nominate one with an “international” flavor.
Godzilla vs Megalon (1973)
Most Godzilla movies are considered campy, but this is somewhat unfair. Much of the ridicule goes toward the dubbing, but this was cheaply added later, so it’s hard to blame Japanese Godzilla movies for that. Another reason may be the silly effects. Well, a lot of Godzilla movies were made in the 60s and 70s, when no monster movie had stellar effects. The ones that did had sometimes 10-20x the budget of Japanese movies.
I’m not going to tell you that all the Godzilla movies were Casablanca compromised by bad dubbing and low budgets. Some of them were simply horrible, even in light of the above extenuating circumstances. A favorite whipping boy is Godzilla vs Megalon, and deservedly so. Plot and sense of scale were ignored, plus there was Jet Jaguar (a robot), tail slides, stock footage, dancing, tag-team wrestling, handshakes, and Jet Jaguar (he gets mentioned twice). Most of the 70’s Godzilla movies had abysmal budgets and were geared toward kids, but even the staunchest G fans have a hard time with this one. Sadly, this is the most common Godzilla movie in the US since it has become public domain, and is therefore most people’s first (and sometimes lasting) impression of a Godzilla movie.
PS: I’m a huge Japanese Godzilla fan. My page in my profile
“It is impossible to defeat an ignorant man in an argument” - William McAdoo
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Nickrz
For The Straight Dope