He gives a similar example I heard a while ago. When we're at a store, we should put down our cell phone and pay attention to the cashier. I remember hearing a story about someone who was shopping, and they thought the other shopper was talking to them and so they answered. The person looked at them strangely, and then the first person realized that the other one is wearing a bluetooth, lol.
Another example he gives is greeting people in the morning and how it makes a differenceClick here