The Police Lieutenant and the boat man interaction is enough to cause you to die laughing on its own. As well as the monster scenes. It's so horrible, it's great!
Aaron Gritsch commented
This is definitely riff worthy, I mean at one point they take time away from the main portion of the film to show the audience a turtle race!
Did you mean Spawn of the Slithis (1978)? Haven't seen it or heard about it. But it looks riffably terrible. So... pretty please with slimy sugar on top? Please riff.
I don't know if you guys have been able to do this movie but it is a must!