Ever since Europeans decided to turn Australia into a Vegemite- and Crocodile Dundee-producing wonderland, the continent has been plagued by rabbits. The rabbit population in Australia numbers in the hundreds of millions, causing anywhere from $100 million to $600 million in crop damage every year. It's led to the extinction of many native plant and animal species and, like a giant semi-arid Elmer Fudd, the continent pretty much has no clue how to get rid of them and often looks stupid when it tries.
The Australians have never been shy about shooting the rabbits, but when you're faced with a few hundred million of the things, you probably need them to line up in front of you about 1,000 deep with every shot to make a difference. Records indicate few if any rabbits actually did this.
From 1901 to 1907, some innovator thought building a rabbit fence would teach the little bastards a lesson. It's unclear if this person had ever seen a rabbit or was aware that they both jump and dig, which we're pretty sure are the two biggest problems any fence has to face when trying to keep something out.
Anyway, the fence took a total of six years to build and stretches for over 2,000 miles, which is pretty impressive. Also impressive is that they found rabbits on the other side of the fence as early as 1902, but still went ahead building the thing on the theory that there are no fence-related problems that additional fencing cannot solve.
In the '50s a little biological warfare came into play. A disease called myxomatosis was released on the rabbit population and estimates believe it dropped the number from 600 million to 100 million. Unfortunately that 100 million were the ones with a genetic resistance to the disease and by the early '90s, their population grew back up to around 300 million disease-proof super-rabbits.
Rising to the challenge, Australian rabbit control teams released Rabbit Hemorrhagic Disease, which can make the rabbits convulse, shoot blood out of their noses and die. This is the point when the rest of the world stood in awkward silence and said, "Dude ... we knew you were serious about the rabbit thing but ... dude."