A duck walks into a bar and says, "You got any grapes?" The bartender says, "No, we don't serve food here." So the duck leaves. The next day, the duck comes back, and says, "You got any grapes?" Bartender says, "No! Go away!" Next night, the duck comes back and says, "You got any grapes?" Bartender says, "No, I don't have any grapes, and if you ask again, I'm going to nail your webbed feet to the floor!" So the next night, the duck comes back and says, "You got any nails?" Bartender says, "No...why?" And the duck says, "You got any grapes?"