A joke is not a thing but a process, a trick you play on the listener's mind. You start him off toward a plausible goal, and then by a sudden twist you land him nowhere at all or just where he didn't expect to go.
“Cinema is a director's medium, so you're saying, 'What do you want?' Being an actor is about adapting - physically and emotionally. If that means you have to look great for it and they can make you look great, then thank you. And if you have to have everything washed away, then I'm willing to do tha”