Maybe I'm Just sick but this is one of my favourite black comedies!
Alot of homages, its like the Texas Chainsaw massacre meets the Hills Have Eyes & big on pop culture references in props, dialogue, music + the character names from Marx Brothers movies (and a character named Jerry Goldsmith); and appearances by the legendary Michael J Pollard in an early scene and Karen Black in fine form.
The villains are not humourless. Bill Moseley plays a great sicko. Sid Haig funny (remember him from 60's TV and 70's exploitation films - even an episode of Get Smart).
The "I remember you" scene where the cop is executed, the scene when Rufus T Firefly wear's the skinned face of one of the girls father in to her and the run rabbit run scene all crack me up.
You're dead, son. Get yourself buried!