I would take a picture of Zach making a ridiculously hilarious face:
I'd show the picture to the kids (Quinn, Max and their cousin Elle), and they would laugh hysterically, and then I'd take a picture of them trying to duplicate it:
(seriously proud moment here. I didn't know Max had it in him.)
It was a great way to pass the time. But since we were dealing with a 5 year old, a 4 year old and a 3 year old, the thrill didn't last very long. In that case, I would suggest this:
Hope that helps for your next long car ride.