Blood Shack (1971) 
Blood Shack (AKA: The Chooper) is a dull as dishwater slasher revolving around a cursed ranch, which is haunted by the ghost of a Native American Indian known locally as 'The Chooper' ...apparently.
I say "apparently", as if that fact hadn't been spelled out to me, I would have been extremely confused as to why a ninja with a sword was over-dramatically leaping about and running around impaling people in the American mid-west... actually, I was still a little confused by this.
Not only is Blood Shack silly beyond all fathomable reasoning, but it is predictable and very poorly acted. The short running time is also filled with long camera pans of scenery, an overlong rodeo sequence, and lots of bland over-narration by the protagonist, Carol, which makes a relatively short film seem very overlong and overly padded.
In summary, I would only recommend Blood Shack to die-hard slasher fans who have a high tolerance for the dull and idiotic.