The War of the WorldsOn October 30, 1938, in what was perhaps the start of the UFO scares and conspiracy theories, Orson Welles' reading of H.G. Wells' book The War of the Worlds sparked mass panic on the U.S. eastern seaboard. This photo is an artist's rendition of what the martian walkers looked like.
Image credit: Meinert Hansen.
For more on this topic, read the Geekend post Conspiracy theories for geeks.