Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
-----------------
Brainstorm Rule: Stay Focused

When participating in a Brainstorm [ For more on 'Brainstorm' go here: http://www.braingle.com/mind/84.html ], it's important to stay focused on the topic. It's very easy to become side-tracked on one particular idea and try to work out all the details of it. Remember that the point of a brainstorm is to generate lots of ideas. There will be plenty of time later to talk in depth about the promising ones. Try to keep focused on the goal of generating as many ideas as possible on the brainstorm topic.
-----------------
For more mind exercises: http://www.braingle.com/mind/