The main pleasure of the book is a series of little biographies of successful teams.
Quoting from the end of their chapter 4: "High-performance teams: very useful models":
[High-performance teams] achieve beyond any measure of reasonableness, and they have fun doing it. The finely developed sense of humor in these groups seems to distinguish them as well. Not everything they do is laced with fun, and there may be some humorless high-performance teams out there. But we doubt it.At this point obviously I should say something funny, but nothing came to me. I end the post on a note of self-reflective anxiety.