why can't you touch the elf on the shelf

Well, the elf on the shelf is a very special elf. He's actually Santa's helper who comes to visit every December and keeps an eye on children to make sure they're behaving well. If he sees you being naughty, he'll report back to Santa, and you might not get any presents! But if you're good, the elf will tell Santa what a good boy or girl you've been. So, it's very important to be on your best behavior when the elf on the shelf is around!