The first Doctor says: "I love doing surgery on Artists, they are so colorful: red Hearts, pink Stomachs, green Spleens."

The next Doctor says: "Me, I love doing surgery on Accountants, open them up and all their Parts are numbered, makes it very easy.

The third Doctor says: "I love doing surgery on Lawyers, they have no Heart, they have no Guts and the Head and the Ass are interchangeable!"