A Slightly Naughty Joke

WARNING!  The following is a little off-color.  Don't tell this story until your friends have their mouths full of food or drink.

I was talking with a sweet elderly lady yesterday, and she told me how disappointed she was with the hearing aid she'd finally gotten.

I asked her why, and she explained that after she'd gotten the hearing aid she had discovered that her farts weren't silent after all.