An Irishman is marooned on a desert island. After months of loneliness and isolation, he's pacing the beach one morning, scanning the horizon for rescue and kicking his toe in the sand.

Suddenly he kicks something with his toe, and and bending down to inspect he finds a magic lamp. Rubbing the lamp he produces the Genie of the Lamp who says, "you have freed me after a thousand years of confinement. You are granted three wishes before I am on my way."

So the Irishman thinks for a moment and says "It's been a long while since I had a proper drink. I think I fancy a pint of Guiness".

No sooner have the words left his mouth than a PERFECT pint of Guiness appears in his hand. "Ah", he says and drains it right down. To his surprise, as soon as he drains the last drop the glass is immediately full again: another perfect pint of Guiness.

He drinks it to te last drop and again it is magically full. The Genie now is impatient and wants to be on his way. "Hurry up now. You've got two more wishes".

The Irishman says, "Let me see. This glass will always be full. No matter how much I drink there'll always be another perfect pint waiting for me."

"Yes, yes", says the Genie, "now hurry it up. You've got two more wishes."

"Hmm", says the Irishman. "In that case.... I'll have two more of these".