Traumatic Insemination

The natural world is strange place. Some bugs mate through stabbing.

http://en.wikipedia.org/wiki/Traumatic_insemination

History of Perpetual Motion Machines

In case you were curious about perpetual motion machines this is not your best page.  If you are interested in the long history of said machines, you're in the right place.

http://en.wikipedia.org/wiki/History_of_perpetual_motion_machines

Dreadnought hoax

A good practical joke might live on in infamy.  A great practical joke will become a Wikipedia entry.

http://en.wikipedia.org/wiki/Dreadnought_hoax