Four surgeons

are comparing the type of patients they consider the easiest to operate on. The first surgeon says, "I like to operate on electricians, because when you open them up everything is color coded." The second surgeon says, "I prefer to operate on accountants, because when you open them up everything is numbered." The third surgeon says, "I think librarians are the easiest to operate on because everything inside them is in alphabetic order." The fourth surgeon says, "I've got you all beat. I like to operate on politicians best. They are by far the easiest because they have no guts, no heart, no spine and their head and ass interchangeable."