A salesman was traveling through the countryside selling insect repellent. He came to a farm house and tried his pitch on the farmer. "Sir, my bug spray is so good, that you'll never be bitten again. I guarantee it!" The farmer was dubious. "Young man, I'll make you a proposition. I'll tie you out in my cornfield buck naked, covered with that bug spray. You’re selling. If there is not one single bite on you come morning, I'll buy the whole case from you." He said. The salesman was delighted. They went to the field and he stripped the farmer sprayed him thoroughly with bug spray and tied him to a fence post. The farmer returned to the house.

The next morning, the farmer and his family trooped out to the cornfield. Sure enough, the salesman was there, hanging in his bonds, not a single bug bite on him. Yet, he was a total wreck. Pale, haggard and drawn. "SON," the farmer said, "you don't have a bite on you, but you look terrible. What happen? The salesman looked up through blood shot eyes and croaked, "Mister doesn't that calf have a mother?