Four surgeons were taking a coffee break and were discussing their work.
The first said, "I think accountants are the easiest to operate on. You open
them up and everything inside is numbered." 

The second said, "I think librarians are the easiest to operate on. You open
them up and everything inside is in alphabetical order." 

The third said, "I like to operate on electricians. You open them up and
everything inside is color-coded." 

The fourth one said, "I like to operate on lawyers. They're heartless
spineless, gutless, and their heads and their butts are interchangeable."