Lil' Johnny attended a horse auction with his father.  He watched
  as his father moved from horse to horse, running his hands up and down
  the horses' legs, rump, and chest.  After a few minutes, Johnny
  asked, "Pop, why are you doing that?"
     "Because I'm thinking of buying these horses."
     Johnny looked worried, "Then I think we'd better hurry home right
  away!"
     "Why?" his father asked.
     "Because the milkman stopped by yesterday, and I think he wants to
  buy Mom!"