It’s expected that every morning I drink a cup of coffee. If I don’t have coffee, that’s unexpected. It’s expected that when it’s time for dinner, everyone comes in and sits at the table. It’s unexpected if one family member gets up from the table and starts dancing in the middle of the kitchen while everyone else is eating their meal. It’s expected that at bedtime, you get into your bed and lay down quietly. It’s unexpected that you come downstairs and ask for more to eat.