You've had an imaginary friend, who calls himself Tom, for as long as you can remember. He's cold, clever, and highly intelligent. Too intelligent. In fact, he says so many things that are beyond what you could ever imagine. But you must've overheard them somewhere else at some point, right? Just as you must've overheard someone else who hisses like a snake and calls it a language. That's what you told yourself before you realized that you were being haunted by the ghost of Voldemort.