A duck walks into a bar.

the bartender says, "what can I get you duck?"

the duck says, "you got any grapes?"

the bartender replies, "no this is a bar, we don't have any grapes."

the duck leaves and then comes back the next day.

the bartender sees the duck and he says, "allright duck, what'll you have?"

the duck says, "you got any grapes?"

The bartender says, "ok duck let's get something straight. we didn't have any grapes yesterday, we don't have any today and we're not gonna
have any grapes tomorrow. if you come in here one more time asking for grapes, I'm going to take your bill and nail it to the bar."

The duck says, "whoa, take it easy!" The duck gets up and leaves.

The next day, the 3rd day in a row, the duck walks into the bar. The bartender sees the duck, rests his hands on bar, leans forward, and says, "ok duck, what'll you have?"

The duck says, "you got any nails?"

Bartender says, "nope."

Duck says, "you got any grapes?"