Satan's School For Girls (1973)
A young woman investigating her sister's suicide at a private girls' school finds herself battling a satanic cult. Future CHARLIE'S ANGEL Kate Jackson appears, as does Roy Thinnes of CODENAME: DIAMOND HEAD.
This film is public domain.
Great film review to prime the riffing pump.
I wasn't certain if this had been riffed before.. (stupid brainfarts).. but I agree this one was great.. mainly because one death scene confused me: the one where the guy drowns in quicksand and his pushed in by the girls. Mainly because when they show them pushing him down with poles, as they're hitting him, it sounds more as if they're hitting a brick wall than a person. And for one minute, it appears as if they are 'stabbing' him with poles than pushing him down. Funny how I can remember these things.