This duck walks into a hardware store. He walks up to the owner and says "Do you have any grapes?"

The owner says "This is a hardware store. We don't have any grapes."
The next day the duck is back with the same request.

The owner says, "I told you yesterday , we don't have any grapes. "

The duck comes back the next day with the same request.

The Owner says". We don't have any grapes and if you come back tomorrow and make the same request, I will nail your flat feet to the ground."

Next day the Duck comes in and says"Do you have any nails?"

The owner tells him "No".

The the duck says "The do you have any grapes?"