I wrote all these idioms out on bits of paper and I thought what I would do is that we would try and insert them naturally into our conversation. The kids went wild for it. They got so involved we had to cut some of our lines because we couldn't be heard over the screaming of pleasure. We've got to make it really natural and easy, you know,. Feel free to sort of like ask a question to direct the conversation in a certain way which leads to you naturally using the idiom from your hand.