A little old lady goes to the doctor and says, Doctor I have this problem with gas, but it really doesn't bother me too much because they never smell and are always silent^{1. As a matter of fact, I've farted at least 20 times since I've been here in your office.}

The doctor says, I see, take these pills and come back to see me next week.

The next week the lady goes back to his office. Doctor, she says, I don't know what you gave me, but now my farts, although still silent, stink^{2 terribly!}

The doctor says, Good, Now that we've cleared up your sinuses, let's work on your hearing.