Abe, Sammy and Hershel are discussing what kind of an engineer might have helped God when He designed the human body.
Abe feels it was a Mechanical Engineer, due to all the moving parts, joints,connections, etc.
Sammy disagrees and says it had to be an Electrical Engineer, due to the inter-related working system sending messages to parts of the body.
Hershel convinced them it must have been a Civil Engineer, because who else would design something with the waste disposal system in the midst of the entertainment area.