The 4 different types patients

Some surgeons were taking a coffee break and 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 think electricians are the easiest. 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 ass are interchangeable."