An Englishman, an Irishman and a Scotsman are walking along the beach one day and come across a lantern and a genie pops out of it.

"I give you each one wish, that's three wishes in total" says the Genie. The Irishman says "I am a fisherman, my Dad's a fisherman, his Dad was a fisherman and my son will be one too. I wish all the oceans to be full of fish for all eternity and a fleet of fishing boats to catch them." So, with a blink of the Genie's eye the oceans were teeming with fish. The Englishman was amazed, so he said, "I wish for a great wall around England, protecting her, and all the foreigners were gone". With a blink of the genie's eye, there was a huge wall around England and all foreigners disappeared. The Scot asks, "I'm very curious. Please tell me more about this wall." The genie explains, "Well, it's about 150 feet high, 50 feet thick, protecting England so that nothing can get in or out." The Scot says, "Ach, double the size of it and fill it up with water."