Received from Florence Campbell:

Three guys, a Canadian, Osama bin Ladin and Uncle Sam are out walking
 together one day. They come across a lantern and a Genie pops out of it.

 "I will give each of you each one wish, that's three wishes total,"
 says the Genie.

 The Canadian says, "I am a farmer, my dad was a farmer, and my son will
 also farm. I want the land to be forever fertile in Canada."  With a
 blink of the Genie's eye, 'POOF' the land in Canada was forever made
 fertile for farming.

 Osama bin Ladin was amazed, so he said, "I want a wall around
 Afganistan, so that no infidels, Jews or Americans can come into our
 precious state."  Again, with a blink of the Genie's eye, 'POOF' there
 was a huge wall around Afganistan.

 "Uncle Sam" (A former civil engineer), asks, "I'm very curious. Please
 tell me more about this wall."  The Genie explains, "Well, it's about
 15,000 feet high, 500 feet thick and completely surrounds the country;
 nothing can get in or out---virtually impenetrable."

 "UncleSam" says, "Fill it with water."