An elderly man goes to the doctor.

He says,

“Doctor, I’m having a problem with gas, but it really doesn’t bother me, since they’re always silent and odorless. Matter of fact, I’ve farted 10 times just waiting for you.”

The Doctor says,

“Take these pills every day for a wee, and then come back and see me.”
A week later, the man complains,

“Doctor, I don’t know what you gave me, but my fatts smell horrible now!”

The doctor says,

“OK, now that your sinuses are clear, let’s check your hearing.”