An Englishman and a Scotsman find a shiny lamp. After giving it a rub, a genie pops out... ""For freeing me, you shall each have one wish!"" says the Genie. ""What is it you want the most?"" ""Well,"" says the Englishman, ""I'm fed up with all these Scots coming down into England. I wish for a giant wall to be built around England, so that no Scots can ever get in again."" ""You wish is my command,"" says the genie. ""It is done. ""What is it that you want, Scotsman?"" After a pause, the Scotsman says, ""Tell me about this wall."" ""It's a thousand feet high,"" says the genie, ""And three hundred feet across. It covers every inch of England's border. It is made of the strongest concrete, and is unbreakable."" ""Good,"" says the Scotsman. ""Fill it with water.""