Mario (Black Sunday, Planet of the Vampires, Dr. Goldfoot and the Girl Bombs , Danger: Diabolik, etc.) Bava's 1963 horror show Black Sabbath seems almost quaint in comparison with the gut wrenching (literally) ongoing output as modern scare films ramped up the realism, blood and gore from the late 60s onward.
Even a few years after it's release, the film proved powerful enough to provide a fledgling blues/rock band from the UK with a suitably "heavy" name, changing from Earth to Black Sabbath - the rest of that story is music history.
Genre stalwart Boris Karloff introduces the festivities and also appears in "The Wurdalak" segment. Heavy on suspense and atmosphere throughout, my favorite of the three tales of terror that make up the movie is the one titled "The Drop of Water, which is the first up in the American version. "The Telephone" is the middle segment in the US release and is also the one most altered from the Italian original.