Catastropic displacement of layers of the univers in the past or in the future is mentioned. Among variants (sometimes combined):
the sky fell on the earth; the earth (the underworld) and the sky interchanged their positions; the earth turned upside down; the layers of the universe collapsed in one after another; they will change their place during the future cataclysm
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
Baby child or children who come out of mother's womb and turn themselves into adult men or a snake who lives in her womb climb up a tree and help the woman to gather fruits, bark, edible fungi, etc. Usually the child who is a snake returns to his mother's womb and adult man turns back into a baby; or the girl's love affair with a snake is discovered when her father climbs a tree to gather fruits for her
Person or creature is transformed. Separate parts of its (his, her) body give origin to different objects or creatures (only etiological narratives are considered)
Magic object, device that makes hunting or fishing easy gets into possession of a person who is unable to operate it or abuses it. The device kills or injures the failure himself, other people and/or disappears
A mighty bird thrust its talons into a big fish, whale, water monster, etc. Talons get stuck, the bird is either pulled down under the water or makes itself free with great difficulty