A duck walks into a hotel and asks the bartender if there are any grapes for sale. Why do you ask?

A duck walks into a convenience store and asks the boss, "Do you sell grapes here?" The boss replied, "No."

The next day, the duck came to the convenience store again and asked, "Do you have any grapes?" The boss was very angry and shouted at the duck, "You have been here once. I told you I don't sell grapes. If you come here again and ask me about grapes, I'll nail your feet to the floor! " On the third day, the duck came again and asked the boss this time, "Are there any nails?"

"no"

"Do you have any grapes?"