A wheat farmer grew their grain but also ground their own flour.
They kept their grain in silos to store before bringing it to the mill for it to be ground.
This farmer was known to be a bit of a curmudgeon, but they had their reasons to be.
The worst sin a person could commit in their eyes was being shiftless.
When they noticed mice chewing their way through the silo walls and getting into the bags of flour, they lined the silos with double layers of plywood and packing the flour in thicker burlap bags.
Not to stop the mice from getting to the grain completely but just to make them work hard to get their fill.