HEHE!

A teacher was giving a lesson on the circulation of the blood. Trying to make the matter clearer, he said: "Now, students, if I stood on my head the blood, as you know, would run into it, and I should turn red in the face." 

"Yes, sir," the boys 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, "'It's because yer feet ain't empty."