H, my parents, and I were driving along by the side of a small, lively river. I looked out the window, and there was S, driving a convertible down the river. Her car went up and down over the rocks & waves; it didn't seem to be in danger of sinking or flipping over, but it was very slow going. When she saw me, she waved and smiled cheerfully. I said, "What are you doing? You're supposed to be meeting us in ---------." We stopped the cars and talked, but S refused to go with us and insisted on driving the rest of the way in the river.