This is a cute one:

During his audience with the Queen of England George W. Bush asked, "Your
Majesty, how do you run such an efficient government?  Can you give me any

"Well," the Queen said, "the most important thing is to surround yourself
with intelligent people."

Bush frowns. "But how do I know the people around me are really intelligent?"

The Queen took a sip of tea and said, "Oh that's easy.  You just ask them to
answer an intelligent riddle."

The Queen pushed a button on the intercom and said, "Please ask Tony Blair to join us."

Tony Blair entered and asked, "Yes, my Queen?"

She smiled and said, "Tony please answer this question. Your mother and
father have a child.  It is not your brother nor your sister.  Who is it?"

Without a pause he answered, "That would be me."  "Very good," she said.

When Bush returned home he asked Dick Cheney, his vice president, the same
question.  "Dick,  answer this for me.
Your mother and your father have a child.  It is not your brother nor your
sister.  Who is it?"   "I'm not sure," Cheney replied.  "Let me get back to you on that one."

Cheney asked all his advisors, but none could give him an answer. Finally,
in the men's room, he recognized  Colin Powell's shoes in the next stall.
He shouts,

"Colin, can you answer this question for me?  Your  mother and father have a
child and it's not your  brother nor your sister. Who is it?"  Colin yells
back, "That's easy.  It's me!"  Cheney smiles, and says,"Thanks!"

Cheney rushed back to speak with Bush.  "Say, I did some research and I have
the answer to that riddle.  It's Colin Powell."

Bush got up, stomped over to Cheney and angrily yelled into his face, "No,
you idiot!  It's Tony Blair!"