A guy in a supermarket goes up to the cashier and places two cans of dog food on the counter.  
   
 The cashier asks, "Do you have a dog sir?"  
   
  "Yes, it's at home," replies the man.  
   
  "To be able to sell you the dog food sir, I must see the dog. That is store policy," says the cashier.  
   
 Next day the man goes places two cans of cat food on the counter.  
   
  "Do you own a cat sir?" asks the cashier.  
   
  "Yes I do, it's at home," says the man.  
   
 "Well I am sorry sir. Store policy. I must see the cat before I can sell you cat food," says the cashier.  
   
  The next day the man returns to the store and walks directly to the same cashier.  He has a brown paper bag in his hand.  
   
  "Here," he says to the cashier, "put your hand in here."  
   
  The cashier puts her hand in the brown paper bag. "It is all soft and warm,"  
   
  he says. "Yes, that's right," says the man,  
   
 "I need to buy two rolls of toilet paper."