Okay so if you're not familiar with the concept of "elf on the shelf" allow me to explain. It's basically just a Christmas tradition where people literally put a stuffed elf on then elevated surface such as a shelf, counter, or fireplace. Pretty self explanatory right?
Well because nothing on the internet is ever kept sacred, people turned elf on the shelf into a rhyming meme. Scroll down past each image to see the answer.