An American tourist arrived at Shannon airport and on his way out from the airport he saw a fellow selling skulls. He told the taxi man to stop. Approaching the skull seller he said `Well Paddy, have you any famous skulls amongst them` Paddy said `To be sure` and holding one up he said `This is the skull of St.Patrick` Not wanting to turn down the purchase of a national artifact the yank said `How much is it` Paddy said ` 20 euros or 120 dollars in your money`. The yank swept up the bargain and went off contented. Some years later the yank returned to Shannon and again he stopped when he saw that Paddy was still in business. `Well, Paddy, have you any famous skulls here`. `To be sure` said Paddy and holding one up he said ` This is the skull of St. Patrick` The yank said `The last time I was here you sold me the skull of St. Patrick so explain yourself Paddy` Paddy said `Ah, this is St. Patrick when he was younger`.