A old man went to the Doctor

An old man went to the Doctor complaining that his wife could barely hear.

The Doctor suggested a test to find out the extent of the problem.

“Stand far behind her and ask her a question, and then slowly move up and see how far away you are when she first responds.”

The old man excited to finally be working on a solution for the problem, runs home and sees his wife preparing supper.

“Honey” the man asks standing around 20 feet away “whats for supper?”

After receiving no response he tried it again 15 feet away, and again no response.

Then again at 10 feet away and again no response.