The technology of animation has gotten to the point where tonight, The Simpsons can end its episode with a wild TV gimmick: having Homer conclude an episode on impov comedy by improvising answers to questions posed “in real time” by fans. How exactly will this be accomplished? I’m not at all sure – but I’m sure I’ll be watching. For more on tonight's special event, see David Hinckley's All Along the Watchtower.