BOO! It's the annual running of the Krampuses.
If the Christmas Doctor Who doesn't have a Krampus, it's missed a trick. Krampus is of course Saint Nicks' shaggy, old-religion, child-beating-after-it's-put-them-in-a-sack assistant. As Christoph Waltz explained to Jimmy Fallon "there's an old medieval tradition that is still kept alive in the mountains, where the young men... put on sheepskin and huge carved wooden masks and cow bells, and they get drunk... and storm like the riders of the apocalypse, through the village." The Austrian kids seem to love it.