The foreman said he wrote a memo with this suggestion to his superiors two years ago, but nothing had happened yet. When he asked why, he was told the suggestion was too expensive. "Too expensive to paint four little lines?" I said in disbelief. They all laughed, "It's not the paint; it's the paperwork. They would have to revise all the manuals.
Quoted from "Personal Observations on the Reliability of the Shuttle" in What Do You Care What Other People Think? by Richard P. Feynman, (W. W. Norton, 1988). This book is enthusiastically recommended, as is his earlier collection of stories, Surely You're Joking, Mr. Feynman!.