Usually they're not that bad, like...
I Drink Your Blood
The Hills Have Eyes (1977)
The Texas Chainsaw Massacre 2
Leatherface: Texas Chainsaw Massacre III
Maniac Cop 3: Badge of Silence (NC17)
Phantasm III (NC17)
Friday the 13th (NC17)
A lot of them were cut and released later as Rs or unedited, the real sick films are on that list I showed you the link to. The MPAA over-reacts so often you need to really weed through the somewhat twisted to find the really disturbing stuff.
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