At one point, when I was 20 and living in Kentucky, I got shot - it was a land dispute over six inches of property that ran a hundred yards through my grandfather's land. It was really over the honor of my family and that of another family. ↗
Sometimes they are a matter of luck; the photographer could not expect or hope for them. Sometimes they are a matter of patience, waiting for an effect to be repeated that he has seen and lost or for one that he anticipates. ↗