Ooh, I wish I'd known that back when I was on Ghost Hunters boards. Some really gullible people thought they'd seen some kind of "ghost star" in a photo, where I was sure a bright star (the ghost star! ooh, scary!) had been cut 'n' pasted in. The star that was pasted in must have been photographed by another camera with a different lens, since no other star in the photo had the same kinds of spiky bits emanating from it.