1. The narrator finds his dog Biryuk injured after his sister beats the dog with a stick for destroying her slippers. This causes the narrator's deep hatred for his mean sister to grow.
2. The narrator's butterfly collection is burned by his sister, who claims the butterflies were attracting ants, despite the narrator keeping them hidden away. This further fuels the narrator's hatred.
3. Seeking revenge, the narrator throws a dead centipede onto his sister's lap while she is embroidering, causing her to shriek in pain and collapse, thinking the centipede was alive. The narrator feels brief guilt but his hatred remains strong.