A 90 years old man is at the doctor and says, “I fart a lot but fortunately, the farts are silent and don’t smell. I have farted 10 times while talking to you and you didn’t notice!”

The doctor replies, “Take these pills and come back next week.”

The next week the man returns. “Doctor,” he says, “I don’t know what you gave me, but now my silent farts stink like hell.”

The doctor says, “Excellent! Now that we’ve fixed your sense of smell, let’s work on your hearing.”