Imagine you are in the water, playing and frolicking about, floating. As you are laughing, talking with others and splashing about, you get a feeling you are riding high on a wave, but you are not overly concerned. Suddenly, you find yourself on top of an 80-foot wall of water that is cresting and crashing below you. In a panic, you try to paddle, swim and then violently thrash to get away from the inevitable tumult, but you are sucked under...