Silent Gas

So---there was this woman who had a problem with silent gas and she went
to the doctor and she said, 

"This is so embarrassing. I have this problem of farting silently. You
probably haven't noticed, but I've let
three of them since I've been in this office with you. Is there ANYTHING
you can do?" 

He said, "Yes, but the first thing is to get you fitted for a hearing
aid."