The Vanishing American Outhouse
I can honestly say that in 20 plus years of library service no one has ever asked me anything even remotely outhouse related. Even though this isn’t necessarily a specific information need, it is one of those books that are purchased to make the collection interesting. Holly calls them serendipity books, or something that browsers can stumble upon, almost by accident. They are part of the recipe for an interesting collection. They may or may not work in your collection, but taking a chance now and then to spice up a collection is often worth it.
This book did have some serious sales and was reviewed by Library Journal with a generally lukewarm endorsement in 1989. A newer edition was released in 2000. Even if potty humor isn’t your particular thing, keep an open mind for those serendipity titles.