Sometimes "No" Means "Yes"

Henry is now in the habit of shaking his head and saying "no" if you ask him a question. The problem is that when he says no he usually means yes. Use the link (http://www.youtube.com/watch?v=QUVIAbvbLlk) to watch the 10 second video (you may have to cut and paste) and then look at the attached photo - you'll get the idea.