Category:No title text

Very rarely it happens that a comic found on xkcd has no title text. Two of those below are from the Category:Extra Comics category. So far only one of the "real" numbered comics have missed a title text, although Randall considers 404 as a real, legitimate comic. 1506: xkcloud not having title text was likely due to the fact that it was an interactive April Fools' comic. The other comic, 404, is not a "real" comic, but a "real" April Fools' joke.