Four surgeons are discussing who makes the best patients on the operating table.
The first surgeon says, "I like to see accountants on my operating table, because when you open them up, everything inside is numbered."
The second responds, "Yeah, but you should try electricians! Everything inside them is color coded.
The third surgeon says, "No, I really think librarians are the best; everything inside them is in alphabetical order."
But the fourth surgeon shut them all up when he observed: "You're all wrong. Politicians are the easiest to operate on. There's no guts, no heart, and no spine, and the head and butt are interchangeable!"