A little old lady went to the doctor and said, "Doctor, I have a problem with gas, but it doesn't bother me much. My farts are always silent and odorless. In fact, I've farted at least twenty times since I've been here in your office. You didn't notice because they're silent and don't smell."
The doctor replied, "I see. Here is a prescription. Take these pills three times a day for seven days and come back to see me next week."
The following week, the lady returned. "Doctor," she said, "I don't know what you gave me, but now my farts... although still silent... stink terribly!"
The doctor said, "Good! Now that we've cleared up your sinuses, let's start working on your hearing."