Joe Dirt is a terrible movie but I not only watched it once, I watched it twice. I could see myself watching it a third time if I were trapped in a rental mountain cabin and it was in the stack of DVDs.
Lisztomania, by Ken Russell, who had made a series of biopics of great composers, each one campier than the last. He got Roger Daltrey to play Franz Liszt as a sort of 19th Century rock star. It has a giant penis that Roger straddles, as rock stars do.
I’ve only watched Samurai Cop as part of Rifftrax (which is hilarious) but I’m confident it would be just as wonderfully outrageous to watch just as it is!
Joe Dirt would be unwatchable if Joe himself was not so likeable. You start to feel sorry for him as he bumbles from one mishap to the next—the septic tank “bomb,” the meteor that isn’t, the tooth balloon—but he remains optimistic, and you can’t help but like him. Well, I can’t, anyway.
Plus Dennis Miller as a condescending radio host and Christopher Walken as a mob boss in the witness protection program. What’s not to like?
Then there’s Battle Beyond The Stars, a cheesey sf remake of The Magnificent Seven, with Robert Culp playing the same type part he played in TMS, down to the dialogue. And George Peppard, regretting having quit Banacek because it wasn’t classy enough, appears as Space Cowboy.
Oh well.
I love the Puppet Master series.
Since you’re willing to go that far, I’ll take one for the team and suggest…The Giant Claw.
Even a theater full of 50’s children laughed out loud at it.
The first in the series was legitimately good. Full Moon has a habit of buying rights to good indy horror films and then making awful sequels.
Robert Vaughn, not Culp. But otherwise an accurate summation.
Rich Koz (Svengoolie, formerly Son of Svengoolie) started that schtick in Chicago in the 70s, when every local UHF station seemed to have their own horror movie host. Why, yes, I do have SEVERAL Svengoolie shirts.
I prefer to think of it as a cheezy SF remake of The Seven Samurai. While indisputably cheezy, the actors could act, the writers could write, and the special effects were not terrible for the time.
Of course, there’s a spaceship with boobs. But still, not IMO a terrible movie.
I’ve actually read the source material, and, yes, it’s a supernatural monster, not a metaphor.
Another movie mentioned in the “Forgotten Movies” thread that fits this one is Joes Apartment. What’s not to love about singing cockroaches? I’ve got that one on VHS!
I laughed so hard at this movie. The look was so perfectly done. If you weren’t paying attention, you could think it was an actual 1950-60s “sci-fi” movie.
My nomination is The Gathering. It’s kind of dumb, but Christina Ricci salvaged it for me. I really cared about her character.
Flesh Gordon. Usually, I laugh at porn flicks because of the stupid plots, awful dialogue, and horrible acting. While FG is not exactly a cinematic gem, I laughed at it because it is genuinely clever and fun to watch. The segment with the monster is my favorite part!
Re: Flesh Gordon
From Wiki:
The film was nominated for the 1975 Hugo Award for Best Dramatic Presentation (the only indie production nominated that year), but lost to Mel Brooks’ Young Frankenstein.
Yes, saw that at a drive-in. I thought it as pretty funny at the time. It had been edited somewhat and re-rated R. I’ve always wanted to yell “After them you dildos!” but the appropriate opportunity has never arisen.
Earth is being bombarded with sex-rays, but the design of the spaceship “was not influenced in any way!”
But if you own a copy on DVD, you are RIGHT OUT! 
We liked that film. Cheesy fun.
Garrrhh! Thanks for triggering my PTSD! I saw Damnation Alley when I was nine, and the only scene I remember - but vividly - was Paul Winfield getting into the wrecked car with the mutant flesh-eating cockroaches. The hell were my parents thinking, letting me see that movie?
Just read that part of the reason Damnation Alley looked so bad was that Fox, the studio, took a quarter of its budget to finish their other sci-fi movie of 1977 - Star Wars.