The electrical engineer says, "It's totally obvious that God is an electrical engineer. I mean, take the brain and the nervous system, they are a symphony of exquisite circuitry."
The mechanical engineer begs to differ. "Sorry mate, God was a mechanical engineer. Look at the synergy between bone, muscle and tendon. It's quite clear that God must be a mechanical engineer."
The civil engineer finally gets his chance and says, "God is a civil engineer. Because only a civil engineer would put a sewage plant next to a recreational area."