The circulation of the blood

A teacher was giving a lesson on the circulation of the blood. Trying to make the matter clearer, she said, "Now, class, if I stood on my head, the blood, as you know, would run into it, and I would turn red in the face." "Yes," the class said. "Then why is it that while I am standing upright in the ordinary position the blood doesn't run into my feet?" A little fellow shouted, "Cause your feet ain't empty."

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