A duck in the shop

A duck walks into a shop and asks the manager:
-Got any fresh fruit?
-No.
-Got any fresh vegetables?
-No.We have only dry goods.

The next day the duck returns:
-Got any fresh fruit?
-No.
-Got any fresh vegatables?
-No.I told you yesterday,we have only dry goods.If you come back tomorrow and ask me the same question,I will feed you with nails!
On 3rd day the duck walks in and asks:
-Got any nails?
-No.
-Got any fresh fruit?