The Elf on a Shelf is a "newish" Christmas tradition where parents place a "magical scout elf from the North Pole" around the house to spy on their children for Santa Claus. Buy it here. As the story goes, the elf then reports back every night to the North Pole to tell Santa if the children have been naughty or nice. The parents then move the elf somewhere else, and the children search for him the next morning... or that's the way it's supposed to go. Sometimes parents have dirtier minds on what the elf is doing when he returns from the North Pole, and here are the funniest examples along with facts about the origin of elves in Christmas lore by The Holiday Spot and Rovaniemi.com, the website for "the official hometown of Santa Claus."
"Elf on a Shelf" is a Christmas toy game for parents to play with their children, but adults like to have some naughty fun with them, too—with drugs, booze, sex, and NSFW poses.