Oh, the Elf on the Shelf! That's a fun tradition. The basic idea is that an elf visits your house before Christmas, watching over the children and making sure they're being good. The elf has magical powers that allow it to fly and even change its appearance. It's a great way to add some extra magic to the holiday season and get kids excited about the big day. But you have to be careful, because if the children don't behave, the elf will report back to Santa!