Here are two scenes. They look unrelated. They're not.
Scene 1
Two people at a café, talking about a restaurant they want to try. A stranger walking past stops: "That place closed six months ago. The one on the corner is better." A brief nod, and they walk on.
The two people exchange a glance, taken aback. Why did that person stop? What did they want?
A few steps away, the stranger is also confused. They had useful information. They shared it. Why did these people react so strangely?
