This is one of the funniest/stupidest movies I've ever seen. As goofy and watchable as Ghosthouse, but way stupider.
Luigi Cozzi (Contamination, Starcrash) made this unauthorized sequel to Dario Argento's Suspiria about a director who decides to make an unauthorized sequel to Dario Argento's Suspiria. His wife, Anne, will play the evil witch. The REAL evil witch is offended that someone will playing her in a movie and jumps out of a mirror and pukes green slime on his wife's face (this is MINUTES into the movie). The rest of the movie is his wife having nightmares about the witch who drones constantly in her head. The movie resets every 10-15 minutes, starting new stories and then abruptly dropping them, as every single story turns out to be a dream. Throughout the entire movie, the witch moans at Anne in her head and says her name approximately eight billion times. The danger, menace, and wackiness keeps ramping up, and the witch gets meaner and meaner until the riveting final confrontation where the witch completely vanishes from the movie and is never mentioned again. Instead the babysitter who you definitely won't recognize because she was barely in the movie at all bursts through the front door and has a Carrie-style psychokinetic battle with Anne and destroys the house with an out-of-nowehere WAY higher production values earthquake in the living room.
Also, the movie has absolutely nothing to do with Poe's The Black Cat, but is named after it and said to be based on it anyway.