My marine head (toilet) requires you to hand pump in ocean water to flush your business. Last night as I pumped, sparkley flashes lit the bowl. There must be some bioluminescent critters in the water. The most happening toilet flushing experience ever!

Update: Confirmed. Swished my paddle around in the water tonight. Definitely bioluminescents down there. A glow follows the paddle, even when I slice it through on the knife edge.