The children behaved well before Christmas because they were afraid Krampus would come to punish the naughty ones.

Krampus 是欧洲民间传说中的一种半人半羊的怪物，专门在圣诞节期间惩罚不乖的孩子。这个名字源自德语，与圣诞老人形成对比，代表惩罚坏孩子的角色。