As they go through they have to practice the taught phrase with you. It can be incorporated into almost any lesson. However, the great thing about teaching is that it doesn't always have to be done in the classroom. You can teach culture in the hallways, outside on the playground, or when going home from school. The best way to teach culture is just by being yourself.
Elementary students are quick.
They'll notice your differences almost instantly and will be quick to catch on. Once you get a feel for your elementary school, teaching culture will come naturally. Now most students are giving each other High 5's. Different hand-shakes are a lot of fun too. Well, think back to those childhood songs you used to sing.