Once when i was flying over saskatchewan about 4 years ago i was absolutely certain i saw a crop circle as i looked out the window of the plane.
I don't know the exact location, but felt that i was very priveleged to have seen one, if infact that is what it was.
Also a number of years ago, i was watching a program where someone was putting the crop circles to music, because some do look like musical symbols.
That would be awesome to hear some of that music, i wonder what it would sound like.