A serious look at humour by Jonathan Miller. While helpless with laughter, have you ever wondered why you're in the grip of this strange respiratory convulsion, and what exactly triggered it? There have been many theories about the science of humour, but tonight Dr Miller suggests a few of his own. As doctor, theatre director, philosopher and comedian rolled into one, he has some intriguing and amusing insights into something we all take for granted. But is he right? See if you think he really manages to explain something that's baffled philosophers and psychologists for centuries.