XKCD usually is pretty good; this one, however, is a brillant commentary on science journalism. People forget that once an event has happened, the probability of that event is exactly 1, and the probability of all other outcomes is exactly zero. (Click image for full-size view.)
I just dug out my old (first issue) copies of Xenozoic Tales. Which I bought, and read, as a young psychiatry resident in Ann Arbor. Funny how xkcd and Mark Schultz have much the same theme.