Ouija board

A Ouija board is a flat board marked with letters, numbers, and symbols, used as a tool for attempting to communicate with spirits or the deceased. Participants place their fingers on a small, movable device called a planchette, which is then supposed to guide them to letters or answers as they ask questions. While some believe it facilitates supernatural communication, many scientists and skeptics attribute the movement of the planchette to the ideomotor effect, a psychological phenomenon where involuntary muscle movements influence outcomes. Ouija boards are often associated with mysticism and have become popular in horror-themed culture.