The Devil has sent me... twins of evil!!!
Trailer for Twins of Evil (1971)

More Info:
Here are my Letterboxd lists for previous Octoblurs:
https://letterboxd.com/dorrk/list/octoblur-2015/
https://letterboxd.com/dorrk/list/octoblur-2014/
https://letterboxd.com/dorrk/list/octoblur-2013/
https://letterboxd.com/dorrk/list/octoblur-2015/
https://letterboxd.com/dorrk/list/octoblur-2014/
https://letterboxd.com/dorrk/list/octoblur-2013/