1st surgeon says: "Accountants are the best to operate on because when you open them up, everything inside is numbered."
2nd surgeon says: "Nah, librarians are the best. Everything inside them is in alphabetical order.
3rd responds: "Try electricians, man! Everything inside them is color coded."
4th intercedes: "I prefer lawyers. They're heartless, spineless, gutless and their heads and their butts are interchangeable."
To which the 5th surgeon, who has been quietly listening to the conversation, says: "I like engineers... they always understand when you have a few parts left over at the end."