Did/do you have meal time house rules?

At our table we had to eat whatever was put in front of us. Leave nothing uneaten or there would be no dessert.
Many a time I would still be sitting at the table well after everyone had finished and left the table. Pushing the food around the plate.
When my Grandmother had washed all the the dishes she would say to me, " Get out of my sight"
No dessert for me and off I would go.