In the vein of MST3K, there's a lot of laughter-inducing shit-on-film out there, and many of us here on EWB love to watch that shit. Recommend/comment/discuss here!
I recently came across a bizarre . . . family film? I think that's what it was meant to be. It's called Meet The Hollowheads.
It's a late 80's futuristic gross-out-pseudo-sitcom movie starring John Glover (Daniel Clamp of Gremlins 2), Juliette Lewis, her brother Lightfield (they play siblings, yet have at least one sexually charged scene), some others, and features an appearance by Anne Ramsey (of The Goonies and Throw Momma From the Train.) It was co-written and directed by a guy who has written and directed nothing else, and primarily made his career in makeup effects - and every bit of that shows.
Basically, take a movie inspired by that Nickelodeon Gak and Garbage Pail Kids era, combine it with a family story and several metric tons of implied (and sometimes direct) sexual situations, and add some of the best terrible acting you've ever seen. That is this movie.