It's almost impossible to make a movie without some redeeming features. For all his limitations, Ed Wood made some pretty amusing movies...
Reflections in a Golden Eye is certainly awful, but it's also quite funny in spots...seeing Marlon Brando ogle the nekkid, horse-riding Robert Forster is pretty amusing, and seeing Liz Taylor whip Brando with a riding crop nearly gave me a heart attack.
Myra Breckinridge had some entertainment value. Not much, I grant you, but there's a scene in the movie which I will refrain from describing (not because it's undescribable, but because it's just plain filthy) because I don't wanna be responsible for turning HHW into a porn site. But, said scene is one I personally found hilarious.
Girls Will Be Girls is indeed every bit as wretched as Jay said. I even fell asleep during the last fifteen minutes or so of the movie...and I almost never fall asleep in the theater.
The wretchedest movie I've seen in recent years is Battlefield Earth: A Saga of the Year 3000, starring John Travolta and based on the novel by L. Ron Hubbard. I have no idea whether or not the novel is as off-the-wall stupid as this movie, and I have no intention of finding out.
The movie takes place 1000 years after these big Rastafarian-looking aliens have taken over the earth, and reduced the human race back into being cavepeople. This doesn't prevent these primative screwheads from finding a US Air Force base, and in a few hours in a flight simulator, the cavemen are ready to fight the aliens in their Harrier JumpJets...where did the flight simulator draw power from, and who has been maintaining Harrier JumpJets in working order for a millienium? No one. They work because the script says they do.
The movie has all kinds of intended satire, which falls flat because it's all either too obvious, or just plain moronic. John Travolta's entire performance as the evil alien overlord is nothing but a bad impression of Bette Davis. Forrest Whittaker is wasted as Travolta's boot-licking lackey. The movie features some of the nastiest-looking set design you'll ever see, and all of the characters are just grungy and filthy-looking. And, worst of all, the director of the movie tilts the camera in every scene, for no discernable reason at all.
It's boring, stupid, and unpleasant. It's not even redeemed by unintentional humor.
It just may be the worst movie I've ever seen.