"Whose Profession is the Oldest?" joke

There was a doctor, a civil engineer, and a computer scientist sitting around
late one evening, and they got to discussing which was the oldest profession.
The doctor pointed out that according to Biblical tradition, God created Eve
from Adam's rib. This obviously required surgery, so therefore that was the
oldest profession in the world.
The engineer countered with an earlier passage in the Bible that stated that God
created order from the chaos, and that was most certainly the biggest and best
civil engineering example ever, and also proved that his profession was the
oldest profession.
The computer scientist leaned back in her chair, and with a sly smile responded,
"Yes, but who do you think created the chaos?"