When is Scrum successful?
A company is not able to deliver its software projects, but does not know why. You introduce Scrum. After 3 sprints you have shown up the problems. Does this mean Scrum works?
I think this very much summarizes what Scrum is about, however I think management will have a hard time to see this as a success...
By the way this question was @EricMinio's answer to a students question "Does Scrum work?". Again a great demonstration of a ScrumMaster's function not to provide answers but to ask the right questions.