Oh!!!! THAT!! I learned something like that about 8-9 years ago. REALLY good stuff. Used to do that on slow mornings, when I was working breakfast in the cafeteria.
One breathing technique that helps focus the breath into the diaphram as opposed to the lungs first is to breath through your nose with the mouth closed and direct the breath to the back of the throat. You'll know your doing it right if you pull a breath hard and you emit a noise from the back of your throat.