This is the title of a new book from Walking Tree Publishers, co-edited by nonother than yours truly, which Downers might enjoy reading. It has some funny bits of its own, but largely consists of scholarly papers devoted to various aspects of humour in Tolkien, in the parodies he has inspired, in illustrations, and amongst the Inklings. It also includes illustrations by well known Tolkien illustrators. In particular, Ted Nasmith, Anke Eissmann, Graeme Skinner, and Tim Kirk have inked some original illustrations for this book.
Abstracts of the papers can be found here:
Laughter in Middle-Earth; Walking Tree Publishers. If you are so inclined as to buy the book, it can be ordered on the WTP website or via Amazon in all it's various international versions.
There is also a group on Facebook devoted to discussing
Laughter, where the contributors are available to answer questions and share in the conversation. (To the best of my knowledge, I am the only Downer who contributed to the book.)
Facebook group Laughter in Middle-earth
Join us on FB or discuss the book here if you wish!
EDIT: Oh, and I forgot to add that the foreword is written by Tom Shippey.