Here's another excellent XKCD suggestion by Tanya Haddad (click on the image to make it larger, more legible. Warning: it gets very strange. I'm pretty sure it's related to something like this). Tanya also sent this wonderful link to a '50's era educational documentary on making maps. Ah, those halcyon days of yesteryear when mylar overlays were the cutting edge tools of the trade. Will GIS professionals ever dress to the nines like that for work.... or anything else?
By the way, go to this actual webcomic, hover over the image, and there will be an additional message in the "title-text" . This one says:
I call Rule 34 on Wolfram's Rule 34.
XKCD has referenced Rule 34 before. I've looked it up and still don't understand it. Something to do with simulating life.