I've been participating in the League of Dubious Film run by friends this summer. The first I saw with them was BeastMaster, which I have no objections to because, hey, Marc Singer in a loin cloth. (Interestingly, we discovered that there are parts of this movie no one had ever seen before because we'd all watched it on TV, and TV usually cuts out shots which include boobies, for example.)
But the second movie was something called Zardoz, starring (believe it or not) Sean Connery in an orange diaper with bandoliers. He's a member of the "Brutals", one of two divisions of the future human race. He's one of the Brutals who is employed by a floating stone head called Zardoz to exterminate as many of the rest of the Brutals as possible, until he decides to stow away in the head and meets the "Eternals" who live forever in the Vortex. The Eternals are apparently very advanced and psychic (or perhaps just prone to weird convulsions; it's hard to tell) but apparently have lost the technology from our time which allows women to keep their tops on. (There does seem to be a common boobie theme in many bad movies. I keep thinking of Joe Bob Briggs.) The immortal line from the beginning of the movie is the stone head roaring "The Gun is Good! The P*nis is Evil!" This lead someone to hypothesize early on that it was a lesbian movie, but we decided after watching for a while it most definitely was not. I finally decided it must have been made by fundamentalist Christians, because while they say it's evil, they obviously can't stop thinking about it for ten minutes.
But I have to give a warning here: The movie is much worse than it sounds. It could easily have been edited down by at least an hour and have lost nothing (except perhaps all the trippy drug related sequences with flashing lights and disjointed sounds and clips). The floating stone head takes up far too little screen time. There are no other lines which compare with the "Gun is Good!" line. The only point to the movie (although poorly made) is that humans shouldn't live forever. (Or perhaps it just wants to communicate that women have boobies, which was a better made point.) It's a truly hideous experience which no one should have to sit through. And yet amazingly, any film, no matter how bad, has its adherents. There are actually crazy people who think this is the greatest science fiction movie ever made.
That said, there are apparently movies that people have found more unpleasant to sit through. I've gotten some amusement out of reading through some of the reviews on BadMovies.org, which gives Zardoz three "droplets". (I think they're slime drops, but I'm not sure.) That ranks it as a middling bad movie. Some movies get only one (described as "A bad movie, even for me"), or a "skull" (described as "This is going to hurt, lots"). Personally I'm intrigued by the five droplet movies, such as Drunken Wu Tang, which is a Kung Fu flick featuring a watermelon monster. Check out the site; it has pictures.