Old lady: “Doctor, I have this terrible problem. I fart frequently but my farts are silent and do not stink at all. As a matter of fact, while we were talking, I must have farted at least 10 times. Since they are silent and they don’t smell, no one is any wiser.”

Doctor: “I see. Why don’t you have these pills every day and come see me again next week.”

When she comes back the next week, the old lady is highly agitated.

Old lady: “Doctor, I have no idea what you gave me. But my farts, though still silent, have started smelling horrible.”

Doctor: “Good. Now that your sinuses are cleared, we can start working on your hearing.”