I had almost forgotten about Kurt Vonnegut when an electronic-mail message came from an old friend of mine less than a month ago. The subject line was kind of surprising: “What’s the difference between George Bush and Adolf Hitler?” The message itself offered the answer: “Hitler got elected.” My friend rounded off his missive with a few words of explanation: “Attributed to Kurt Vonnegut.” The joke smelled of the writer, too. I was thus taken aback when I found his obituary in your last issue (April 21, 2007). Could it be the joke about Bush and Hitler was his very last one?