Explain xkcd: It's 'cause you're dumb.
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Self-reference is a recurring theme in xkcd comics, and it is most famously illustrated in comic 688: Self-Description, which is one of the footer comics featured in the bottom segment of The topic of self-reference has been revisited multiple times since Randall jokingly vowed never to squeeze humour out of self-reference again in 33: Self-reference.