This old lady walks into the Doctors office and says, Doctor, please help me. I have a terrible problem with farting. Its not really a social problem, because you cant smell it or hear it, but I must have farted 20 times since talking to you.

The Doctor nods his head and says, Take this bottle of pills and use them all. When they are all gone in about 2 weeks, come back to see me.

The old lady comes back 2 weeks later and is angry. She says What was in those pills? I fart just as much. You still cant hear them, but now they smell horrible!

The Doctor again nods his head and says, Great, that takes care of your sinus problem, now lets work on your hearing.