Here’s a story.
A development team was thrashing as they attempted to use Scrum to help them build a new application. They had numerous defects, some of which escaped to production and others that were caught within each Sprint. Many defects they thought they had fixed popped up again in production.
Their stakeholders had high expectations, as the team’s velocity was high. After several Sprints, it became clear they were not going to deliver all the planned features by the defined deadline. The news came as a surprise to stakeholders.