There are many UFO photographs out there, and some that go viral, have this effect.
A photograph taken inside through a window, where you get the outside, AND a reflection on the inside. This is obviously a lightbulb, but many have no circulated of intricate chandeliers, disc shaped lighting recesses and other light fixtures, and to my amazement each time, they go viral and people think it is an alien spaceship.
This was something easily recognizable, and wanted to post it as an example of the effect itself, so you can see how it is done.
No, this is not my photo. You can find the original poster on Reddit (the original posting appears to have been removed).