Dave found a book in Edinburgh last year called the Psychology of Laughter. It was written in 1913. An exact century of time later Dave brings the volume to a new audience, updating it for now and explaining exactly why we laugh at the things we find hilarious. Which is a dangerous thing to do in a comedy show. Like going to a strip club with a dude and saying, 'blood is now activating your erectile tissues'. Anyway. Come along.