A couple took their son, 11, and daughter, 7, to Carlsbad Caverns. As always, when the tour reached the deepest point in the cavern, the guide turned off all the lights to dramatize how completely dark and silent it is below the earth’s surface. The little girl, suddenly enveloped in utter darkness, was frightened and began to cry. Immediately was heard the voice of her brother: "Don’t cry. Somebody here knows how to turn on the lights."