The Elf on the Shelf is a popular Christmas tradition for children, but it's also something that some adults find entertaining and magical. The idea is that the elf is Santa's helper who watches over the children to make sure they're being good, and if they are, the elf will reward them with a present. For some adults, the idea of having an elf watching over them and bringing them presents can be a fun and lighthearted way to get into the Christmas spirit.