Another joke

I don't know why, but I thought this was an extremely funny joke...

So a duck walks into a bar and he goes up to the bartender and asks, "Do you have any... grapes?" The bartender says, "No, this is a bar, we have booze. Beat it." So the duck backs out of the bar. Then the next day the duck goes back into the bar and says, "Do you have any... grapes?" The bartender says, "Look, I told you yesterday, we don't have any grapes. Now get lost!" So the duck backs out of the bar. Then the next day the duck goes into the bar again and asks, "Do you have any... grapes?" The bartender says, "Look, I've told you twice already, no grapes! If you come back in here asking for grapes again I'm gonna nail your bill to the counter!" So the duck backs out of the bar. Then the next day the duck goes into the bar and asks, "Do you have any.... nails?" The bartender looks puzzled and says, "Uh, no, we don't have any nails." Then the duck says, "Well then, do you have any... GRAPES?!"