Surely We Can All Agree On This

Three surgeons are discussing who makes the best patients to operate on.
The first surgeon said, "Electricians are the best - everything inside is color coded." The second surgeon says, "No, I think librarians are - everything inside them is in alphabetical order." The third surgeon shut them up when he said, "You're all wrong. Politicians are the easiest to operate on - no guts, no heart, no balls, no brains, and no spine - plus, the head and the ass are interchangeable."