First I thought, "what are you?" ...then I grabbed my camera with the sharp lens on it.
This was hanging out on the deck behind our house earlier today. Some well-chosen Google keywords told me it was a Hypercompe scribonia, the Great Leopard Moth. Pretty, for a bug. I didn't notice it was iridescent until I hit it with the camera's flash. Click to enlarge.
This has been an interesting couple of weeks when it comes to seeing huge moths I've never seen before. Please excuse the muddy long-end of my telephoto lens: