An Irishman finds a Genie lamp and rubs it. Out comes the Genie and asks, “Master, you have released me from the lamp and I grant you three wishes. What would you like?” 

 The Irishman scratches his head,  then answers, “A bottle of Guinness that never gets empty.” 

“Granted, master,” retorted the Genie and  produced the bottle. The man was delighted and got roaring drunk on this one magic Guinness bottle for weeks, then he remembered that he had two other wishes. He rubbed the lamp again and the Genie appeared. “Yes, master? You have two more wishes. What would you like?” 

“You know that magic, never-ending Guinness bottle?” he asks the Genie. “Well, for my final two wishes, I’d like a pair of them.”