Have you ever watched people in their cars? I would see a woman with a scowl on her face, or the very important businessman rushing to work while shaving? Women and makeup or family vans where hand gestures are big and every body in the vehicle is moving. Or someone really rocking out with their stereo? Those are great. I know I'm someone you will see be-boppin' in the car.
So, here's the game. Turn that person in the car into a character. Give them a reason for what you observe. Maybe the girl rockin' out to the stereo just found out she's been accepted to the best college. Make something up and write a short story or a novel. Or just giggle to yourself at your own version of reality. Whatever works, right? :0)