How do you create familiarity with your victim so they get a bond with you?

Have you ever been to buy something big, a house, a car, an expensive service of some sort? And the person selling shares a joke with you, that's what's happening, they're building rapport. And all the people getting excited about being victims, we are all victims if we allow it to happen whether it's buying a car and it breaking or somebody just wanting to cut the queue. It doesn't have to mean we're being crucified.