On a late working night, three engineers are sitting around in the office discussing the nature of the universe.

On a late working night, three engineers are sitting around in the office discussing the nature of the universe. You know, says the first one, God is a mechanical engineer at heart. Just look at the human skeleton. It's one of the most marvelous physical structures ever devised. Sure, the skeleton is pretty impressive, but it's nothing compared to the brain, says the second one. It is, without a doubt, the most extraordinary information processing device the universe has ever seen. No, God is a computer scientist. No doubt about it. You're both wrong, the third one says. God is a civil engineer. What? The other two ask, baffled. Sure, the third engineer says. Who else would run a sewage line through a recreational area?