In my family, we call this sort of thing instant karma* and cling to it as a reason to not be completely depressed by the world.

* So dubbed after being stuck in backed-up traffic and watching a car in front of us pull into the wrong lane, pass a long line of cars, and make a turn around the stopped cars to continue merrily on their oh-so-more-important-than-ours way.

Then the police car a few spaces behind us flipped on its lights, pulled around traffic and chased that motherfucker down.

No lie, we cheered and punched the sky.