The summer heat is oppressive. Mr. M, seated beside his pool, looks at the cold water. "What could be better than a refreshing dip?" he thinks. He dives headfirst into the water and takes a couple of powerful strokes. Then, suddenly, he stops. He exhales, sinks to the bottom and simply stares straight ahead. "I'm drowning," he realizes, strangely unperturbed. He knows that a few strong kicks would bring him back to the surface. But he can't quite bring himself to do so.