Urine Expert

An Englishman, an Irishman and a Scotsman met The world's foremost wine expert who could, blindfold, tell The name and origin of any sample of wine. The Englishman handed him a sample and after a few tastes The expert said. That's a claret, French 1953 I would say.'
'Correct,' said an impressed The Englishman. The Scotsman handed him a sample and after a few minutes The expert said That's a Chianti, Italian, 1979.'
'Correct,' said The Scotsman.
The Irishman piddled into a glass and handed it to The blindfold expert. After a few tastes, he spluttered and said, 'Why that's urine.'
'Correct,' said The Irishman, 'but whose?'

'