Nature never ceases to surprise us. Dennis Mersereau published this photo that was supposedly taken in the skies over Tunisia. It had been circulated widely in social media and Mersereau was rightly skeptical of photographs that go viral because they are often doctored.
But in this case, he found a video of that cloud formation that seems to support the photo. Of course, with CGI techniques becoming more freely available, there is the possibility that even the video is also doctored but it seems unlikely that someone would have gone to all that trouble.