After reading what other cultures have visiting on Christmas eve night I'll stick with the jolly fat guy. These visitors would give a kid nightmares if they slept at all. I wouldn't tell a kid a story like this, would you? Have you ever been told stories like these?
Gryla is one of many female trolls who live high up in the mountains of Iceland.
Her story goes back to pagan times, but in more recent centuries she has become part of Christmas - making the trip down to the towns and cities, searching for naughty children.
She returns to her cave with a bag stuffed full of crying youngsters, whom she boils alive and gobbles up
Bogeymen: Five scary visitors in the night