My Cat is Staring at the Wall

Minky the great grey hunter of our house is staring at the walls again. He even got up out of his cat furniture from sleeping to go stare at the wall. I used to think he was just crazy, but now I know better. He is a patient little man. Eventually whatever he hears in the wall will come out and he will have his way with it. Hopefully this will all happen in the middle of the night when I don't have to see it.