She asked him again not to make a sandwich on the cupboard top. The cats jump up there and you don’t know what they are leaving there! Here, use a plate?
The man shouted that she was nagging, he didn’t need a plate. She tried again, there could be viruses or bacteria, you haven’t wiped it down?
But he still wouldn’t listen. So she decided to accidentally sprinkle coffee grains and sweetner on the cupboard. At least then if he went to make a sandwich he might use a plate? But no, he didn’t but at least he wiped the cupboard down!