Four engineers were sitting around one day trying to figure out who might have designed the human body.

The first fellow says "I think it might be a Mechanical Engineer, because of joints and muscle and sense of balance." The other three nod there heads and say "Yeah, could be."

The second fellow says "I think it might be an Electrical Engineer, because of the nervous system and neural network." The other three nod there heads and say "Yeah, could be."

The third fellow says "I think it might be a Chemical Engineer, because of hormonal balances and metabolism." The other three nod there heads and say "Yeah, could be."

The fourth fellow snaps his fingers and shouts out "I know, it HAD to have been a Civil engineer!" The other three ask "Why?"

"Well" says the fourth fellow, "who else would put a waste water drainage right through a recreational area!"