This image recently appeared in the Feb. 2006 issue of National Geographic Adventure magazine. It struck me as a little "hard to believe..." but I figured hey, its Nat. Geo, so it must be real.
Well, don't you know that they printed a retraction in this months issue in response to letters they recieved questioning the authenticity of the photo.
"Early in the selection process we were assured by the photographer and his agency that the photo was real. While Hawaii is a place where magical things happen, further technical analysis proved - and the photographer eventually admitted - that the image was a digital composite."