Duck and Grapes

One day, a duck walked into a bar and asked for grapes. "Sorry," said the bartender, "We don't have any grapes." Then the duck went home.

The next day, the duck came back and asked for grapes. "I told you," the bartender said, "We have no grapes!" The duck, once again, went home.

The next day, the duck came back and asked for grapes. "I told you!" The bartender said impatiently, "WE HAVE NO GRAPES! If you come and ask that again, I'll NAIL your bill to the floor!" The duck hurried home.

The next day, the duck went back to the bar and asked, "Do you have any nails?"

The bartender replied, "No, we don't." "Oh, okay," the duck said, "Do you have any grapes?"