1917 in a small village named Cottingley, two cousins -10 year old Frances and 16 year old Elise took several photographs. When the pictures were released publically two years later they caused a huge stir. You see, the girls had photographed themselves with fairies and a gnome. The girls maintained the photographs were real until they were both elderly. Along the way, they'd managed to convince the public and even Sir Arthur Conan Doyle was taken in.
Looking at the photographs now, it looks like exactly what they are - cut out drawings. However, for a brief time, people believed. We live in a different time. Information is available at the click of a mouse, people are looking to disbelieve more than they want to believe. So, my writerly friends... what could you come up with to fool the world? What stories can you create? With your words, can you make people believe?
To learn more, here's a link to wiki: http://en.wikipedia.org/wiki/Cottingley_Fairies
And another: http://www.lhup.edu/~dsimanek/cooper.htm