Whoa, can I whip out the preschool teacher!
When the parents started yelling at the server, after their hideously undisciplined offspring almost knocked her over while she was carrying a full tray of drinks, Ms. Preschool Teacher came out. I told the girls to go sit down, NOW. And told the parents that they could apologize to the server for not controlling their children, or I could find a manager to kick them out, because there were many other tables of people who were not going to tolerate their nonsense. When they tried to call my bluff, I asked for the manager, and eventually, they were asked to leave because the other people in the restaurant backed me up.
Moral of the story? If you won't make your kids behave, I will do my damndest to make them behave, because that's what I do for a living.