Peter goes to the doctor and says, Doctor I have this problem with gas, but it really doesnt bother me too much. They never smell and are always silent. As a matter of fact Ive farted at least 20 times since Ive been in your office. You didnt know I was farting because they didnt smell and are silent.

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

The next week Peter goes back. Doctor, he says, I dont know what the hell you gave me, but now my farts, although still silent, stink terribly.

Good, the doctor said. Now that weve cleared up your sinuses, lets work on your hearing.