Friday, it's a magical day, it's music day with Canibal

King Diamond - Them (1988)

As the album opens, a young King and his mother and sister are welcoming King's grandmother home from a mental asylum. That night, King investigates strange voices and discovers his grandmother having a tea party alone, with the teacups and kettles floating in the air. King is promptly sent back to bed.
On another occasion, Grandma awakens King and tells him that she will teach him about Amon, their house, over a cup of tea. Grandma cuts King's sleeping mother's hand and adds her blood to the teapot. The voices of the house ("Them") begin to affect King with a drug-like effect. King's sister Missy tries to convince King that they should do something to help their mother, who is unconscious under "their" power, but his judgment is clouded due to his altered state. He refuses to call for help and cuts the phone line. At tea, Missy interrupts and furiously expresses concern about her mother's state and breaks the teapot. "They", in response to the breaking of "their" teapot, chop Missy into bits with an axe and throw the remains into the fireplace in the kitchen. King is snapped out of his "spell," and he stumbles outside and pieces together the events that transpired.
After fainting and regaining consciousness, he decides to attack his grandmother. He notices that "their" power is weakened outside of the house, so he lures his grandmother outside and kills her. The voices of Amon continue to haunt the boy as he is questioned by police and incarcerated in an asylum. Years later, he is released and returns home to find his grandmother and the voices of Amon are still very much alive.