It's not the fact that O'Rourke is trying to be funny about serious material that damns this book to the bottom of his otherwise enjoyable oeuvre. Nor even that recent tragedy has ruined his old jokes. The problem, rather, can be contained in a dart aimed, quite some time ago, by that ambivalent, English Left-winger, Christopher Hitchens, at this ambivalent, American Right-winger: "Not funny enough."