What kind of pictures do Christmas elves take most?

This joke is a playful pun combining the word “elf,” a mythical creature often associated with Christmas, and “selfie,” a term for a photograph that one has taken of oneself, typically with a smartphone or webcam and shared via social media. Elves are popularly known as Santa Claus’s helpers in Christmas folklore, busy making toys and preparing for the festive season. The humor in the joke comes from the clever wordplay where “elf” is combined with “selfie” to create “ELFie,” implying that if elves were to take photographs of themselves, they would naturally be called “ELFies.”