Another thing that people often say is "Nice day, isn't it?" This is one thing I don't say to people, unless I want to talk about the weather, and actually I find weather interesting and want to talk about it, but the problem is that other people don't ask this because they want to talk about the weather, but as a greeting - it has a social function.
Point taken. I suppose if I were to encounter someone completely naked walking around, I'd be tempted to say to them, "Nice night for a walk. Wash day, tomorrow. Nothing clean!"
Sometimes such a scripted conversation might come in handy.
