Self-reference has been used often in xkcd and most famously in 688: Self-Description which is one of the featured comics at the footer of the xkcd comic. This also means that it has been used several times since Randall promised (already then in vain) to never again squeeze humor out of self-reference, in the comic after which this category is named: 33: Self-reference.
This category has only the following subcategory.
Pages in category "Self-reference"
The following 9 pages are in this category, out of 9 total.