The Drawing Carousel
I heard good reports about this workshop when it was run at the 2004 XPDays and I wasn't disappointed at XP2005. Vera Peeters used the analogy of a group collaborating on a drawing to guide 8-person teams through an exploration of what pair programming is about. From the perspective of someone who has experienced pair programming teams already I think that I mostly had fun (!), observed some forming, storming, and norming close up, and got a better idea of the perils of ignoring what you know to be "right" (e.g. integrating early and often, reflecting on and adjusting your process) just because the customer starts with a different perspective to your own.