In response to this xkcd, ASofterWorld finally strikes back. ((Both of these use the mouse-over-to-see-the-punch-line trick.)) ((Chris: I assume that you saw this xkcd.))
These are two of my favourite webcomics; I read them every day, along with Jesus and Mo, UserFriendly, Sinfest, and the delightful Questionable Content. I also feed the slightly more twisted aspects of my persona with Explosm and Basic Instructions.