You have to know about stuff like this when you have a kid.
Apparently, there is a blog devoted to archiving as many versions of "the diarrhea song" as possible.
Most of these seem rather, uh, strained (sorry). For instance: "When you’re rummaging in the attic / and your ass goes automatic." Still, it's good to know there are connoisseurs out there devoted to finding the "finest variations" of this little ditty.
(Horror of horrors: the version I learned as a kid -- "some people think it's funny / but it's really wet and runny" -- isn't there yet.)
When I was a kid myself, I used to be fascinated by the idea of a "kids' culture" -- which was pretty viable despite the fact that most kids didn't have direct access to mass media. Turns out other people find that fascinating too.