While it contains elements of other genres like:
* Crime: The story revolves around a kidnapping.
* Adventure: The characters embark on a journey with the kidnapped boy.
It's primarily classified as humor due to its:
* Satirical tone: The story mocks the absurdity of the situation and the incompetence of the kidnappers.
* Irony: The kidnappers are the ones who end up being victimized by the boy's mischievous behavior.
* Witty dialogue: The characters' interactions are full of sharp and humorous remarks.
Overall, The Ransom of Red Chief is a classic example of O. Henry's signature "surprise ending" and humorous storytelling.