Krampus, the horned half-goat half-demon hybrid sent to torture naughty children and drag them to Hell isn't exactly the stuff of good holiday cheer. But this anti-Santa creature's history is as fascinating as it is terrifying. With roots in Paganism and Norse mythology, Krampus has been reminding children they better be good for ages. Remember, it's not just Santa who knows if you've been bad or good.