I brought my computer-controlled rover that can transmit video from an onboard camera (posted about here) to the World Festival to show at the LEGO booth. Some of the children there had a lot of fun learning how it worked and driving it around the pit area outside the booth, using the camera to see where it was going. This little guy especially enjoyed it... I love the look on his face. :-) We were trying to drive it out one side of the booth and navigate it through suddenly-dangerous shoes (you know, those gigantic monsters that can crunch NXT robots at will?) to the other side.