I Have Verified the Randall Munroe Wikipedia Philosophy Hypothesis for 'cheese sandwich' and 'Gorillaz'.

Wed 25 May 2011 | -- (permalink)

Context from the hover text on today's XKCD:

Wikipedia trivia: if you take any article, click on the first link in the article text not in parentheses or italics, and then repeat, you will eventually end up at "Philosophy".