Once a teacher was teaching a lesson on the subject of blood circulation. She was trying to make the matter clearer, so she gave example, “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?”
Little Sunny shouted,
“Cause your feet ain’t empty.”