Surgical Subject

So, it seems this group of surgeons were sitting about
during an interlude, when the usual topic came up...

The first surgeon said:

"Accountants are the best to operate on because when
you open them up, everything inside is numbered."

The second surgeon said:

"Nah, librarians are the best. Everything inside them
is in alphabetical order."

The third pipes up:

"Try electricians! Everything inside THEM is color
coded."

The fourth sneers:

"Lawyers. They're heartless, spineless, gutless and
their heads and their butts are interchangeable."

To which the fifth surgeon, who has been quietly
listening to the conversation while sipping from a
bottle of Jack Daniels (as all surgeons do between
operations), says:

"I like engineers... they always understand when you
have a few parts left over at the end."