Bill and Mary were enjoying the Chapel service but about half way through the sermon, Mary let her mind wander. Inadvertently she let out some wind. Concerned of the unpleasant consequence, Mary took a pen and paper out of her purse, and wrote a note and handed it to Bill.
The note said:" I just let out some silent wind, what do you think I should do?"
Bill scribbled back: "Put a new battery in your hearing aid."