I know what I would have done.I would ask a simple question; "Why did you teach them to act like that"?

There was a Greeter at Wal-Mart who was on duty this day when an obnoxious slattern came blustering in with two brats in tow. She was screaming at them and making idle threats. The Greeter said, "Good morning, nice set of twins you have there." She replied, "What? that one is 6 and the other is 8. Why did you think they are twins"?
He said, "I just couldn't believe you got laid twice."

I'm afraid I wouldn't last long at Wal-Mart.