Dull Men of Great Britain by Leland Carlson: Book #11 for 2016
Short book about real people who have hobbies and interests relating to the completely mundane - self-confessed "Dull Men". There's nothing cliched like train spotting or bird watching, instead it involves people who collect milk bottles or beer cans, or run a postage stamp museum.
It was fascinating to read some of the "dull" pursuits that some people have and I'm still wondering if I would qualify as a "dull man" myself.