
In Germany, the 6th of December is Nikolaustag. The night before, children will clean their boots, and put them outside the front door. Nikolaus puts sweets, nuts, oranges and maybe small toys into those boots.
The cleaned boots prove that the children were good.
This picture is from a Nikolaus-Party showing not just Nikolaus (who looks like Santa Claus here), but also his companion, Knecht (Farmhand) Ruprecht who punishes children if they misbehaved (This is just in theory of course. For children it's usually enough if they see him. =) At this party he pointed out the bad behaviour of the children and told them to be good from now on.)
If you want to read more about this traditon, check
Wikipedia.
PS: Congratulations to my mum, who celebrates her birthday today!!! =X