"George W. Bush, running as the pro-education candidate, made many campaign stops at grade schools where he posed for pictures, while reading to kids or chatting with them in class. At one photo-op stop, a teacher was giving a lesson on the circulation of the blood.

Dubya chimed in, trying to make the teacher's lesson clearer. He said: "Now, children, if I stood on my head the blood, as you know, would run into it, and I would turn red in the face."

"Yes, sir," one of the girls said.

"Then why is it that while I am standing upright the blood doesn't run into my feet?"

From the back of the room a little voice said, "'Cause your feet aren't empty?"