An old farmer—who is known to be a hypochondriac—complains to his doctor:

"I cain't taste nothin'. I cain't ever tell the truth. And my memory is goin' bad besides."

The doctor goes out to his chicken coop, fetches some chicken droppings, rolls it into little balls, and puts them in a medicine bottle. He gives the bottle to the farmer and tells him to take one pill immediately, and chew it up carefully.

The old man does so, and says, "Hey! That tastes just like chicken shit!"

The doctor says, "Well, your sense of taste is pretty good. And you can tell the truth as well as anybody. Now, if you ever feel like you're losing your memory again, you just take another one o' them pills!"