Tales from the Darkside (1984)

Season 1: Episode 17

Cathy Osborne brings her husband up to a previously-unknown room in their house and along with her friend Michael, relates the tale of how the room is the "madness room" from which no one has ever stayed the night...and survived. In reality it's a set up and Cathy and Michael plan to kill Cathy's husband by scaring him to death. They succeed by faking some supernatural activities, but soon find that the curse of the room is all too real...