image creditImagine for a moment that you're snorkeling in the exquisite cerulean waters off the coast of Australia, when you notice amidst the rocks a small octopus. It's well camouflaged against its background, but, upon seeing you, the startled cephalopod's body suddenly lights up in a brilliant pattern of blue rings.
Instead of recognizing what is obviously the animal's colorful warning display and backing off, you move in to get a closer look, at which point the panicked animal promptly bites your outstretched hand. You've just been bitten by the blue-ringed octopus - one of the more venomous creatures in the Pacific Ocean.
