It is true that some of the books are to be taken with a pinch of salt.
I'm tempted by the best selling: "The Life Changing Magic of Not Giving a F**K" by Mark Manson
One of my friends has a collection of books with amusing titles, and unlikely Title/Author combinations: I'm going to stay at his place on a cycling trip soon and I'm looking forward to browsing his bookshelves eg.
‘Are You Dancing?’ by R. U. Asking
‘Art and Culture’ by Phyllis Stein
‘Artificial Weightlessness’ by Andy Gravity
‘Back Problems’ by Eileen Bent
Well, starting to stray off topic.
Often think about writing a book about window cleaning that would only be of interest to hardcore window cleaning geeks.
Plenty of options here, eg: "Your Panes are My Pleasure", "Through the Glass Darkly", "Clearing the Mist from the Glass" etc, etc.
As a retirement project one day, I'd like to write a book about vintage windows. Some of the windows we clean are breathtaking in their beauty; and the craftsmanship you see in their construction is sublime - and they won't be around forever.