He's warned them about horseplay before. We'll see how much they learned.
At least, it used to. Once it carried your germs and hairballs, now it carries your unhealthy lunch and comic books.
Step 8: Kick back and admire yourself for being such an awesome parent.
And nothing drives frustration like a bored child on their way to a weekend at the grandparents.
See that funny Canadian man on the TV? That's Red Green. You will learn more from him than any knowledge a parent can impart.