You never know who you're going to bump into on the red carpet, and this week my colleague Gregory Ellwood got a chance to interview Tom Bergeron at the D23 Expo. Though the host with the most was there to promote "Disney Legends," Greg asked him about "Dancing with the Stars" and the new, shorter format. While ABC had aired a separate results show in previous seasons, going forward the celebrity dance competition will combine performance with results. 

In this clip, Bergeron explains the new format, as well as how he's going to keep the sometimes loquacious judges on track to plow through a truncated show. He mentions stun guns. I think he's joking, but really, not a bad idea.