A Scotsman & a Englishman are strolling along the beach when they find a lamp. They clean it up and out pops a genie. " I'll give you each one wish for freeing me" says the genie.
The Englishman thinks then wishes. " I believe in an England for the English, I'm sick and tired of all these Jocks coming into My country. I wish for a huge wall around England - to keep the English in and the Scots out" POOF and it's done.
The Scotsman thinks. " Genie ? " he says " Tell me about this wall". " Well" says the genie "it's 500 feet high, a third of a mile thick, nothing can get in and nothing can get out". "OK" says the Scotsman "Fill it with water".