Pick, and pick again, one keystroke per choice. We'll take three. We're dubious about buying vegetables that we can't squeeze, but decide to take a big gamble on four tomatoes. Bill to the credit card number permanently stored in my software, I instruct, with another tap of a single key. On the last menu presented, we specify delivery tomorrow afternoon between 3 and 5.
Tomorrow comes, so do the groceries.
The tomatoes are fine. The delivery man carries the bags right into our kitchen. As I say, my wife went bananas. She's telling every 30-something friend she has. They all react the same way.