This Day in the History of Hoaxes (and Pranks): June 26

June 26, 1998: Discovery of the Marree Man
A pilot flying in a remote region of South Australia spotted an enormous geoglyph carved into the ground, depicting a man throwing a stick. No one had seen the figure before. Nor did anyone know how it had come to be there. Its creation was assumed to be the work of pranksters. To this day, no one has confessed to making it. [wikipedia]