Problem:
A quarter of the way through development of your project, you realize a key component has been left out of the project specification. The business unit must be notified and must agree to the changes in the project specification.
When you (as Project Manager) mention this to a business unit manager in the hallway, he publicly blames you for not doing your job right. Write the dialog that would occur at the team meeting as you describe the process you would use to deal with this situation. Be sure to include ideas for managing expectations and the steps one can use to manage angry people.