Uncle Au is a usual wood goblin loving to frighten and misbehave. Once he woke up and surprised, how the world changed around. And even children now are not afraid of him.
Once Koshchey the Immortal caught the Cat-Scientist and complained that he was bored and had no one to torment. In exchange for help, he promised to let the Cat go. The Cat, as such help, offered Koshchey to marry, but in order not to scare away the brides, he advised the villain to dress up as a good fellow. Despite such a cunning trick, Koshchey failed time after time.
The fairy tale forms the idea of the child that nothing in life is given just like that. To achieve something, you need to work hard, and you need to pay for "light bread".
