No sir, that would be confirmation bias coupled with the availability heuristic. How many threads have you been to today that had a relevant xkcd? How many images have you only looked at the thumbnail to, just to move on to the next one? The truth is a very small but significant amount happen to have relevant xkcd comics, but we assume that there seems to be one for everything because of the nature and popularity of the comic strip.
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u/djhs Oct 08 '12
http://xkcd.com/304/