A great way to convey the power of the Unconscious Mind is to show it in action. I found this clip on YouTube and if a picture speaks a thousand words then this just speaks volumes. In this clip the Conscious Mind is busy talking to the interviewer. The Unconscious Mind is doing everything else. I bet you'll watch this more than once.
You can easily link a YouTube video to your course when you are using a Learning Management System. Then your students see the video in the context of your course, at the point where it has maximum impact.