'Operation Cupcake'
In June, 2010~Intelligence hackers deleted articles by Osama bin Laden and replaced bomb-making instructions with a cupcake recipe. The original article, titled "Make a bomb in the Kitchen of your Mom," instructed would-be terrorists how to create a lethal pipe bomb using common kitchen items, such as sugar, match heads, and a mini light bulb attached to a timer.
1910 Halley's Comet~
In 1910, as Earth passed through the tail of Halley's Comet, people bought "Anti-Comet Pills", special "comet umbrellas", and gas masks, because there was public hysteria that all life on Earth would be destroyed by gas - called cyanongen - that was found in the tail.