Nothing But Trouble
I'll try to explain it, I'm not so good at that and I'm sure most people know it already. But here goes....
A group of snobs get caught by the local law, which happen to be a group of freaks that have a rather twisted idea of justice.
Two of the arrested then try to make their way out of the dilapidated mansion via a sewage pond while the other two (Chevy chase, Demi Moore) witness the judge (Dan Aykroyd) take himself apart only to end up later having wieners for dinner with everyone and planning Chase's characters wedding to the judges mute niece (John Candy).
After that all goes downhill they try to escape the misshapen twins in the junkyard. Moore's character then get's caught and needs to be rescued.
And there's some pureed people, Digital Underground get's funky with the Judge tearing up his solo on the organ, and there's a bed pan fight in there somewhere.
I think it might be a fun movie for the Rifftrax guy's to do because it's a weird movie already and theres so many odd characters I think they could come up with some good stuff :-)