Jim Shore's blog entry, XP Designs All the Time, reminded me of something I've faced in literally every TDD training I remember myself hosting--after a live demo of me pair programming with someone on the projector, every single time two things come up:

• "I knew the bit about refactoring mercilessly but I always thought it was just exaggeration"
• "It was fascinating to watch how the two of you were constantly carrying out little design sessions"

Just like with any other technique, you get so much more out of observing closely when someone more experienced with that particular technique is at it. In fact, the same holds for just about any combination of skill levels on the part of the observer and the observee. If only more people could see others do TDD...