Spencer Johnson's Who Moved My Cheese? is a short parable (it takes 20 minutes to read) that follows two mice and two “little people” through a maze as they decide what to do when the cheese they're used to finding suddenly isn't there anymore.
Everyone's reading this little book because everyone's living it. And the point of the story — we have to seek out new approaches to problems — is the reason hundreds of companies, from PepsiCo to PepBoys, are using it to help train their people to understand the nature of change.