One very common phenomenon is that whenever there's something hard to explain in a photograph, most people just attribute it to "photoshop". This is, in fact, the lazy answer to every such picture. It's always "photoshopped". People are really lazy in their skepticism and are, in my opinion, missing out lots of interesting research that could be done into such photographs. Sure, there are tons and tons of images out there that have been manipulated, but that's not always the true explanation. Sometimes the real explanation is much more interesting. In many cases the photograph is actually completely genuine and unaltered, but does not depict what it might look like at first glance. A very good example is the so-called "time-traveling hipster" photograph: This photo was taken in 1941 (at the re-opening of the South Fork Bridge in Gold Bridge, British Columbia). The man looks very out-of-place compared to all the other people around, way...