Four surgeons were taking a coffee break and discussing their work.

"I think accountants are the easiest to operate on," said the first surgeon. "You open them up and everything inside is numbered."

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

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

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