In Photoshop-speak, we call them faux-tographs.
Michael Shermer presents this lesson in falsehoods as a children's craft project. Just tie up some kitchenware to an old fishing pole, flash the photo and ta-da! There's your err... evidence!
Believer or not, there's a remarkable similarity in these fuzzy shots of Derby Day hats and those black and white stills framed in Roswell's museums.