AustLit

'A boy stays at his aunt and uncle's house; his uncle has started acting like a mouse, so is locked in the basement. His aunt explains that the uncle had previously invented a machine that acts as a mousetrap, but instead of killing the mouse, it causes it to run away. Similarly, a mouse that has been hiding in the boy's room acts like a person; the boy later finds out that if two animals touch the machine at the same time, their brains swap. By Paul Jennings'  (https://en.wikipedia.org/wiki/Uncanny_(short_story_collection))