Ultimate Reality

Tonight's "Ultimate Reality" features Derrick Neill, an eighth-grade teacher from the landlocked town of Sierra Vista, Ariz. For most of his adult life, Neill has had an abiding interest in great white sharks. We see him hum the theme to "Jaws" to his bemused students. "Ultimate Reality" takes him to South Africa to spend a few harrowing moments in a shark cage as the deadly fish gnaw on some bloody chum.