The Beyond (1981, original title: E Tu Vivrai Nel Terrore ‒ L’Aldilà, also known as Seven Doors of Death)
The Bogey Man (1980, also known as The Boogeyman)
Blood Feast (1963)
Bloody Moon (1981, original title: Die Säge des Todes)

The Beyond is Lucio Fulci, enough said. The Bogey Man is a supernatural slasher with a few strange ideas. Blood Feast, “the first splatter film”, is a dodgy weird old classic. Bloody Moon is slow and uneventful.