In one of his books Rooney describes heading out across America to find out the reasons why people choose to do the work they do, he said he could never understand why a garbage man would want to pick sanitation as a career, his observations were summed up by a visit to a janitor of a hospital.
When Andy asked the cleaner why he did his job fro a living the guy responded that his job was the most improtant in the facility and he took pride in the responsibility it brought, Andy kind of looked down on the cleaner and asked how it was that he thought he was more important than a brain surgeon or cardiologist, these people went to school for years and earbed six or seven figures for the work they did.
The cleaner took a moment and responded by saying "it doesn't matter if they are the best sergeons in the world, if I haven't cleaned the "OR" to the best of my ability odds are good that the pateint will catch and infection and may even die!"