I came across this and thought it might amuse:

Three blokes - a Canadian farmer, Osama bin Laden and an Aussie engineer
are all working together one day and 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 states."

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".....