Answer: When you hear an opening in the conversation you’d like to explore further, say “Now that is interesting.” Then say why you think it is interesting.

This is another Edward de Bono conversational tip.  He says:

You need to get into the habit of saying: ‘Now that is interesting.”

Once you are ready to use that phrases you can now direct the phrase at anything that comes up in the conversation. . . It is like having a bow and a quiver full of arrows. At any moment you aim your arrow at a particular  point and let fly: “Now that is interesting.”

You will need to explain why you find that point interesting.