This Vonnegut quote turned up on BoingBoing:
"Do you know what a Humanist is? I am honorary president of the American Humanist Association, having succeeded the late, great science fiction writer Isaac Asimov in that functionless capacity. We Humanists try to behave well without any expectation of rewards or punishments in an afterlife. We serve as best we can the only abstraction with which we have any real familiarity, which is our community.
"We had a memorial services for Isaac a few years back, and at one point I said, "Isaac is up in Heaven now." It was the funniest thing I could have said to a group of Humanists. I rolled them in the aisles. It was several minutes before order could be restored. And if I should ever die, God forbid, I hope you will say, "Kurt is up in Heaven now." That's my favorite joke."