People in the Czech Republic celebrate St. Nicholas's Day on December 5.
Read the blog post Strange Traditions: St. Nicholas's Day in Prague.
Groups of three dressed as St. Nicholas, a devil, and an angel set out into the night to judge children to decide who has been naughty or nice this year.
If the child has been good throughout the year, they get candy.
If the children haven't behaved, the devil throws explosive rocks, yells at them or even shoves them into his sack to be “taken to hell.” Some Czechs defend this tradition in the name of building character and toughening up children.
A majority of the Mikulas trios I witnessed were teens. I can imagine that they were just trying to retaliate for being tormented as a small child.