Fish Do What in It?

While it's unclear exactly what their role will be, goldfish will somehow be used to monitor the water at the upcoming G20 summit in South Korea:

In addition to thousands of heavily-armed police and troops, six goldfish will put their lives on the line to safeguard world leaders at this week's G20 summit in the South Korean capital.

The Convention and Exhibition Centre in southern Seoul which is hosting the event will use the fish to check the purity of the water supply to restrooms, an official said Tuesday.

"The fish also symbolise an eco-friendly water policy, which recycles used water for the restrooms," Oh Su-Young, PR manager at the centre, told AFP, adding that they were just part of the inspection process.

Because there's nothing that says "drink me" like a nice tall tumbler of clear, cold water with a goldfish swimming around in it. We're put in mind of the explanation given by W. C. Fields as to why he avoided drinking the stuff.