I try to remember here how I liked the books I read (and what books I read in the first place :-))
These books are only those that I really read to a big extent. So I leave out all the books I read half, but then had something better to do or technical books where I looked something up and then went on. And also I neglect Comics :-(
For the books I read in German, I will try to provide the english title.
A very readable exploration of a british journalist, who researches the true history of humor under communism. Said humor is known to be the funniest and most cynical humor created by oppressed humans that we know of ('Why, despite all shortages, was the toilet paper in East Germany always 2-ply? Because they had to send a copy of everything they did to Russia.'). Many argue that it helped bring communism to its end. Lewis put this hypothesis to a test and this book is the well-written tale of this test, in which he speaks to many interesting old people all over Eastern Europe (and his eastern-german ex-girlfriend), sprinkled with many jokes. I learned even more about communism history on the way. Maybe not a coincidence that it works well when a resident of one great humor-culture (Britain) researches another great humor-culture.