Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Idea on the Go

Have you ever had a great idea when you didn't have access to a pen and paper? Maybe you were driving your car, on the bus, running a marathon, or scuba diving. You can use the Loci [ For more on 'Loci' go here: http://www.braingle.com/mind/110.html ] system to help you remember the idea later. To do this, associate your idea with a location inside your house. The next time you see that location, you will remember your idea and you will be able to write it down.
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For more mind exercises: http://www.braingle.com/mind/