What’s so funny about dirty water? Not a whole lot. When I was a kid, you could swim in the Santa Monica Bay without having to worry about contracting hepatitis; today, every surfer I know is vaccinated against it. My friends say similar things about lakes in the Midwest and rivers in the East: The waters are no longer safe to fish and swim in, not to mention drink. The contamination comes from so many sources: fracking, big agriculture, industrial manufacturing, just to name a few. And it seems like the lack of government regulation has let pollution spiral out of control. So the idea of making a joke out…