Bodachs

These malicious house spirits of the Scottish Highlands have the form of a shriveled old man who lives up the chimney in the daytime and comes out at night to punish naughty children, tweaking their toes, ears and noses, pulling their eyelids open and staring into their eyes, and inflicting horrid nightmares. If the child's behavior improves the bodach will leave him alone, but it is wise to put a pinch of salt in the fire as well, to keep the bodach in his lair.

Bodach - also Bugbear or Bug-A-Boo.  They slide down chimneys to kidnap naughty children.