When I was a kid, my best friend and I were looking at old photos in his house. There was one of a family wedding, a group shot outside our local church. One of the men in the photo had no legs. Not like, was in a wheelchair or anything, but literally in the photo, his legs just stopped at the knee and you could see the huge old slabs of the church - they even matched perfectly with the slabs that were on either side. It was exactly the same as if you were looking at a photo and looked at the wall above his head, rather than below his knees.
Now, I can't blame digital trickery as this photo was WAY too old for that (70s, maybe?). Maybe someone with a working knowledge of photography could explain it.
The weird thing is that the guy in the photo (my friend's uncle) ended up with diabetes and had both legs amputated at the knee years later.