While visiting England, George W. Bush is invited to tea with the Queen. He asks her what her leadership philosophy is. She says that it is to surround herself with intelligent people. He asks how she knows if they’re intelligent.

“I do so by asking them the right questions,” says the Queen. “Allow me to demonstrate.”

She phones Tony Blair and says, “Mr. Prime Minister. Please answer this question: Your mother has a child, and your father has a child, and this child is not your brother or sister. Who is it?”