Three freshman engineering students were sitting around one day arguing
about who might've designed the human body.

The first one said, "It must've  been a mechanical engineer. The human
body has all those levers and pivots and stuff - a mechanical engineer must
have designed all that."

The second one said, "No, it had to have been an electrical engineer. The
complex way the nerves are wired up to the brain must have been designed by
an electrical engineer."

Then the third on said, "No, it was a civil engineer.  Who else would have
run a waste water line through a recreational area?"