#CharlieCharlieChallenge is a popular hashtag on Twitter today. According to the BBC Trending blog, it refers to a game which involves balancing pencils over the words "yes" and "no" on a piece of paper. Players ask questions which are supposedly answered by Charlie - a mysterious demon who spookily moves the pencils, if you believe in that sort of thing. The BBC says, "if you believe in that sort of thing" because it does sound pretty goofy: A mysterious Mexican demon moving pencils around at the behest of eleven-year-old Mackynzie, who wants to know if Conor likes her or not. Who...