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. They never smell and are always silent. As a matter of fact, I've farted at least 20 times since I've been here in your office. You didn't know I was farting, because they don't smell and are quite silent."

The doctor says, "I see. Please take two of these pills each day, and come back to see me next week."

The next week the lady comes back. "Doctor, she says, I don't know what the hel_l you gave me, but now my farts - though still silent-really stink terribly."

The doctor replied, "Good!!! Now that we've cleared up your sinuses, lets work on your hearing... "

A very good variation on a theme...

Had to think that one through!