As we drove down the highway we saw some kids wrestling/fighting and trying to throw each other into traffic.
So I rolled down my window and in the most authoritative and disapproving way possible I yelled HEY!
You might ask why I would do that. It's because that's the sort of thing I do, that's why.
Of course the kids obeyed my implied command, stopped fighting and started walking away with a look of fear and trepidation on their faces. What if that crazy man came back?