What is the theme of "The Night the Ghost Got In" by James Thurber?

The theme of any story is the main idea that the author is trying to get across to the reader. Most stories have multiple themes. 

This story is concerned with themes of absurdity and the supernatural. Thurber is a comedic writer who often deals with themes and ideas as they relate to absurdity. Aside from this, the primary theme of the story is that of the defiance of man to change. The characters in the story want safety and consistency. They are threatened by the world outside their home, and stand in defiance of those forces.