You know the feeling, you're driving down the interstate and the girl in the car next to you catches your eye, and for the next ten miles you exchange glances, and smiles.
You let her in, she lets you in. She passes you, and then you pass her again, "chasing cars" is the game and for a brief moment in time the thing is on. The world rushes by and you forget about everything, including your exit that you passed 3 miles ago.
But as quick as she appeared, she's gone. Forever.