Teens are filming themselves trying to summon a demon named Charlie in the latest challenge that’s gone viral online. Participants put two pencils on a piece of paper in the shape of a cross, with the words “yes” and “no” written inside the four sections created by the writing tools. They then ask, “Charlie, Charlie, are you here?” An ancient Mexican spirit then supposedly enters the home and can be asked any question that has a yes or no answer. Droves of teens–and some adults–have taken to posting videos on social media of themselves freaking out when one of the pencils moves. Think of this as the Internet’s answer to the Ouija board.