I have no clue how I first stumbled on it, but take a look at this recent entry- The Smackdown Learning Model.
What happens to your brain when you're forced to choose between two different--and potentially conficting--points of view? Learning. That's what makes the smackdown model such an effective approach to teaching, training, and most other forms of communication.Cognitive dissonance meets Celebrity Deathmatch. You gotta love/hate it.