You're driving down the bustling main street of a picturesque little town you have never visited before. The traffic light turns red, you stop, and an old lady steps into the crosswalk from the left. All of a sudden you are overcome with a feeling that you have been here before--in the same car, at the same crosswalk, with the same woman stepping off the curb in the same way. Yet by the time she reaches your front bumper, you realize the scene no longer matches quite so well with what you thought you were recalling. And you do know you have not been here previously. The familiarity is broken.