Patient, "Well Doc, I've got the farts ... I mean I fart all the time"
Doctor nods, "Hmm."
Patient, "Funny enough, my farts do not stink and you can't hear them. I fart all the time, we've been talking for about 10 minutes or so and I've farted five times. You didn't hear them and you don't smell them, did you?"
"Hmm," says the Doctor, Doc picks up his pad and writes out a prescription.
Patient is thrilled "Doc this prescription, will really clear up my farts?"
"No," sighs the Doctor, "The prescription is to clear your sinuses. Next week we'll get you back for a hearing test."