way. You go see a movie. And it has an unexpected twist — something that you didn't expect — and you find a joyful experience. You look at those sort of illusions in my book and it's not as what you'd expect. And there's something joyful about it. And it's the same thing with jokes and all these sorts of things. So, what I'm going to try and do in my lecture is go a little bit further and see if I can violate your expectations in a pleasing way. I mean, sometimes expectations that are violated are not pleasant, but I'm going to try