You know, there used to be a pretty good comic called “Big Stone Head” which was nothing like this particular strip, but enjoyable and funny. I went looking for it again, but apparently the guys who did it are now mainly blogging and doing hilarious short films like this one. They didn’t have the comic archives anywhere I could find them, but it’s a good blog.
I know so little about Aztec mythology that I basically scanned Wikipedia for the name of a male god that fit the speech balloon here. But a lot of the mythology I do know, mainly the Greek and Norse, always contains these kinds of weird-ass side stories involving improbable biological acts. I think that the idea of a kidney stone the size of a tool shed is inherently funny, no matter what else I did with it.