Old lady goes to her doctor.
After a while the doctor asks her what the problem is.
"You won't believe this", she says, "but I can't stop farting! Thing is, they are completely silent, and they have absolutely no odour at all! In fact, since I came into this room, I've farted at least 20 times!"
"Mmmm'" says the Doctor, reaching into his drawer and pulling out a bottle of pills. "Take one of these every 4 hours and come back in a week."
A week later she again comes in to his office and he asks her if there's been any developments.
"Well actually, yes," she days, "I'm still farting all the time but now my farts STINK! What have you done!"
"Good" says the doctor, "I've cleared up your blocked nose, now let's work on your hearing!"
