Pretty dated now (that family's house is seriously not up to code) but a cute story about the thought process of a four year old. It was one of the examples on the TVTropes page Right for the Wrong Reasons.
This story was wonderful, even if dated. Follow the logic and thought patterns of a four year old, as he tries to make sense of the world with no experience, and little help from his parents and big brother. Even that little is inadvertently misguided. All he can do to learn what "shorts" really are is by his own experimentation, and listening to the discussions of the unexpected results. He becomes a hero by doing exactly the right thing, having arrived at the conclusions that guided his actions by precisely the wrong reasons!