The experience of dying.
A man is dying and, as he reaches the point of greatest physical distress, he hears himself pronounced dead by his doctor. He begins to hear an uncomfortable noise, a loud ringing or buzzing, and at the same time feels himself moving very rapidly through a long, dark tunnel. After this, he finds himself outside of his own physical body...
Soon, other things begin to happen. Others come to meet and help him. He glimpses the spirits of relatives and friends who have already died, and a loving, warm spirit of a kind he has never encountered before - a being of light - appears before him.