When I was little, I used to watch the Moomin cartoons. It was based on the children books by Tove Jansson. The cartoons were pretty fun, but sometimes things got scary. One episode, children everywhere had the pleasure to meet one of the scariest (if not THE scariest) character ever to appear on the TV screen: Hufsa/Mårran/the Groke/Buka/Mörkö
She/it may look creepy, but combined with this theme:
YouTube - Mårran/Groke/Buka/Mörkö/Hufsa Theme 1
It's a nightmare, and has haunted me through my childhood.