An old farmer goes to the doctor. The doctor asks him, "What's wrong?"

The man says, "I must be getting old."

The doctor says, "Well, what are the symptoms?"

The man says, "Well, I can't taste anything. I can't ever tell the truth. And my memory is going bad."

The doctor goes outside and finds some horseshit, which he rolls into little balls. He puts several of them into a bottle and gives them to the man. He tells him to take one right away, and that he should chew it up.

The man pops one pill into his mouth, chews it, and spits it out, saying, "Damn! That tastes like horseshit!"

The doctor says, "Well, I see it has cured your sense of taste. And you can tell the truth pretty good. And if you ever think you have lost your memory, just take another one of them pills."