The Norwegian Spiral

http://gizmodo.com/5422574/giant-mysterious-spiral-takes-over-the-skies-of-norway

http://gizmodo.com/5422792/this-is-how-the-mysterious-giant-spiral-happened

http://aliencasebook.blogspot.com/2009/12/3-videos-massive-blue-spiraling-ufo.html

Pretty impressive!