A little elderly lady goes to the doctor because she has been having a problem. She tells him "Doctor, lately I have been farting almost constantly. They don't bother me much because they don't smell or make noise, but it is still annoying. I've farted a hundred times since I got here, I bet you didn't know."
The doctor sends her home with some pills and she returns a week later. Angrily she tells him "Doctor! These pills you gave me have made my gas smell terrible. I don't want to take them anymore!"
The doctor smiles and replies "Great. Now that we have cleared your sinuses we can take care of that hearing problem."