A concerned husband goes to see the family doctor and says, "I think my wife is deaf because she never hears me the first time I say something, in fact, I often have to repeat things over and over again."
"Well," the doctor replies, "go home tonight and stand about 15 feet from her and say something. If she doesn't reply, move about five feet closer and say it again. Keep doing this so we can get an idea about the severity of her deafness."
The husband goes home and does exactly as instructed. He starts off about 15 feet from his wife in the kitchen as she is chopping some vegetables, and asks, "Honey, what's for dinner?"
He gets no response. He moves about five feet closer and asks again. No reply. He moves five feet closer. Still no reply. He gets fed up and moves right behind her, about an inch away, and asks again, "Honey, what's for dinner?"
She replies, "For the fourth time, vegetable stew!"