[!["This is the reference implementation of the self-referential joke."][1]][2]
Alt text: ""This is the reference implementation of the self-referential joke.""
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The source of this answer contains three links to http://xkcd.com/917/: this one, the one before, and the one before the one before the latter one mentioned in this sentence. [1]: http://imgs.xkcd.com/comics/hofstadter.png [2]: http://xkcd.com/917/
