You take a picture of the first item and the app tells you it???s actually 50 per cent off if you scan the coupon at the checkout.As you are about to pay, the app tells you that there is an item highlighted that you didn???t pick up from one of the aisles. ???Are you sure you want to continue????Okay glass, Google ???The Internet of Things.???If you haven???t heard the term, it???s okay.