Sherilyn Fenn and Kyle MacLachlan on the set of Twin Peaks, 1990© Moviestore Collection Ltd/Alamy"At the time I was making Twin Peaks, I was fixated on the number nine (now I love the number seven). But I played this game I made up called License Plate Game, a ridiculous sort of game. If you see your initials on a car and the numbers add up to your favourite number, and the car is very good – that’s the highest you can get. An X is a wild card. If there is an X on the license plate you can make it any letter you want. It’s good if you...