If they're going to behave like animals, all the food goes into a bowl on the floor of your porch and they can eat like that until they're ready to apologise and behave properly.

That threat worked on us as kids! But my parents were BIG on table manners and thus if I used a fork incorrectly that would be the threat. Heaven help me if I was holding cutlery while I took a drink!

You're not a bad mum, your son is a bad son. See how he likes that!