Inhabitans of the Middle World are (partly) destroyed (or will be destoyed) once by fire or draught, another time by a flood or the world is destroyed with a flood of fire or boiling water
The couple of close relations originates the mankind
In the beginning of time or after the natural disaster brother and sister, mother and son, or father and daughters are the only human beings. They marry and the present day people are their descendents
Being alone and having no other marriage partners, brother and sister agree to marry each other if a highly improbable event or a series of events will take place. Among the events that take place (alternatively or one after the other) are 1) the siblings let two grinding stones roll from two mountains, the brother's stone falls on the sister's one; 2) brother and sister throw two swords from two mountains, both swords get into one sheath; 3) they throw some objects up, the objects get together; 4) they kindle two fires, columns of smoke get together; 5) they put to grow two stems of bamboo, tops of the stems get together
In the beginning of time or after the natural disaster brother and sister are the only human beings. They marry and the present day people are their descendents
Killed and destroyed (often burned) person or creature (usually ogre, fierce animal, powerful shaman) turns into a multitude of biting insects or into other small molesting creatures
Person is sent by god to bring instructions or certain objects but distorts, forgets or replaces them. This has fatal consequences for humans or for a certain species of animals. (Lithuanian case can be a mistification)
God sends his messenger to tell people that they should eat only rarely (once in three days or the like). The messenger tells them that they should eat often (three times a day)
First one, then another man meets a powerful person or persons. The first man is worthy and rewarded with treasure, prestige or the like. The second man (or two men) follows him, behaves in a wrong way and is punished
A man loses an axe. A spirit or a powerful official suggests him a golden axe but the man does not accept it. The spirit (official) gives him axes of gold and silver as a reward for his honesty. Usually another man intentionally loses his axe, claims the golden one but receives nothing
Small objects and animals (rare: animals alone but including those who really are harmless) revenge on a powerful enemy making attack on him in succession (usually they hide in his or her house); the enemy is badly injured, runs away or dies