That reminds me of a joke I heard a while back..
..You see, Uncle Sam, The leader of Canada, and Osama Bin Laden were walking along the beach one day (ok, that part is a bit wierd now that I think about it) and come across a genie's lamp. They rub it.. and out pops the genie. The Genie grants each one wish.. The canadian goes first, a farmer by trade. He thinks for a few moments and says "I am a farmer, I want all of Canada to have lush soil, and bountiful harvests from now on". The wish was granted, and Osama goes next. He thinks for a moment, and says "I want a massive wall around all of the Middle East, to keep out the infidel". It was granted, and on to Uncle Sam.
Uncle Sam, a former civil engineer thinks for a moment, and asks, "How big is this wall?" The genie smiles, and says "The biggest human kind has seen, A mile up, and a mile thick. Nothing can get in or out." Uncle Sam thinks for a moment once more, and says.. "Fill it with water."
Haha. I think I might have screwed it up a bit, but you get the idea.
LOL, I like that one.