"Gas" joke
An old woman visits her doctor and tells him, "Doctor, I have this problem with gas, although it doesn't really bother me very much. They are always silent and never smell. Actually, I've farted at least 15 times since I've been here. You couldn't tell though because they are silent and don't smell."
"I see," says the doctor. "Take these pills and make an appointment to come back to see me next week."
The following week the old woman returns to the doctor's office. "Doctor," she says, I don't know what the heck those pills were that you gave me, but now my farts are still silent but stink something terrible."
The doctor replies, "That's good. Now that we've cleared up your sinus problem, let's work on your hearing."
Not enough votes...