A mathematician, a doctor, and an engineer are walking on the beach and
observe a team of lifeguards pumping the stomach of a drowned woman. As
they watch, water, sand, snails and such come out of the pump.
The doctor watches for a while and says: "Keep pumping, men, you may
yet save her!!"
The mathematician does some calculations and says: "According to my
understanding of the size of that pump, you have already pumped more water
from her body than could be contained in a cylinder 4 feet in diameter and
6 feet high."
The engineer says: "I think she's sitting in a puddle."