Duck Food

Seems this duck waddles into a grocery store and asks the 
Manager "Do you have any duck food?"

The manager says, "No, we don't have duck food.  This is a 
'grocery' store.  Now get out of here."

The next morning the duck waddles into the same grocery store 
and again asks the manager, "Do you have any duck food?"

The manager, speaking slowly and distinctly, says, "NO! I told 
you yesterday that we don't have duck food."  Get out of my store 
and don't come back!"

The next morning, sure enough, the duck enters the same grocery 
store and asks the manager, "Do you have any duck food?"

The manager screams, "NO! WE DON'T HAVE DUCK FOOD AND IF YOU COME 
IN HERE ASKING FOR DUCK FOOD ONE MORE TIME I'M GOING TO NAIL YOUR 
WEBBED FEET TO THE FLOOR!!"

The next morning the duck enters the grocery store and asks the 
manager, "Do you have any nails?"

Resigned, the manager says, "No, we don't carry nails.

"Good," says the duck. "Do you have any duck food?"