Answered nature's call this morning before sunrise and got a surprise when I flushed - the water glowed! Marine heads flush into holding tanks using water from the ocean, or in my case the Chesapeake Bay. When I pumped the handle the water entering the bowl lit up like a christmas tree. I tried to photograph my glowing bowl, but alas the glow was to faint to be recorded by my camera. After doing a little research I discovered the culprit was the bioluminescent microorganism Noctiluca (latin "Night Light") native to our waters.