1. A house with a brass sign on the door saying: 'Never mind the dog -- beware of the owners.' I didn't think people actually put things like that on their houses.
2. I've discovered another murder house. It's a huge Edwardian villa, exactly like all the other huge Edwardian villas on the road. But this one has a scruffier garden, and you can look through the kicked in front door and see daylight coming down the stairs.
3. The cheering sight of my own front door. We have recently had it repainted -- it's black, like 10, Downing Street and looks very smart and imposing.