I've witnessed A-10s flying low over lake Texoma. They made sweeping passes over the same group of boats from several directions. I don't know what exactly they were doing, but my guess is they were using boats on the water for practice target runs, or they were using the contrast of the boats against the water to calibrate instruments. Or, maybe they were just showing off for ladies they knew were watching. What ever the case, it was fun, and scary, to watch.