An Aussie, A Canuck and Osama bin Laden

[mick_dundee]

Three blokes - a Canadian farmer, Osama bin Laden and an Aussie Engineer are all working together one day they come across a lantern and a Genie pops out of it.
"I will give each of you one wish, which is three wishes in total"
says the Genie.
The Canadian says, "I am a farmer and my son will also farm. I want the land to be forever fertile in Canada."
POOOOFF! With the blink of the Genie's eye, the land in Canada was forever fertile for farming.

Osama bin Laden was amazed, so he said, "I want a wall around Afghanistan, Israel, Palestine, Iraq and Iran so that no infidels, Americans or Australians can come into our precious state."
POOOFF! Again, with the blink of the Genie's eye, there was a huge wall around those countries.

The Aussie Engineer says, "I am very curious. Please tell me more about this wall."
The Genie explains, "Well, it's about 5000 feet high, 500 feet thick and completely surrounds the country. Nothing can get in or out; it's virtually impenetrable."

The Aussie Engineer sits down, cracks a beer, smiles and says, "Fill it with water."