Merry Christmas. Good children receive gifts from Santa and bad children get eaten by the Christmas Leopard. Look - don't get angry at me, I don't make up the rules.
The problem with Christmas is that children are too confident about the whole thing. They're tottering around all cool and jaded, basically because you never taught them to fear Krampus the Christmas Demon. So thanks to your bad parenting kids don't believe in demons and now they're out of control! Well, don't worry - I can help you out. Sure, they don't believe in demons but you know something they do believe in? Leopards. You're welcome.