A duck walks into a bar and looks to the bartender. "Do you have any raisins?", he asks. The bartender looks to the duck and says, "No, we don't have any raisins."
The duck leaves.
The next day, the duck comes in a gain. He goes to the bartender. "Do you have any raisins?", he asks. The bartender scowls, "No, we don't have any raisins."
The duck leaves.
The next day, the duck comes in yet again. He asks the bartender, "Do you have any raisins?" The bartender steams in anger. "NO! We don't have any raisins. And, listen here, if you ever come in here again asking for raisins, I'm gonna nail your bill to the bar!"
The duck leaves.
The next day, the duck comes in again. The bartender glares at him. He asks, "Do you have any..." The bartender stares him down, "Yes?" The duck continues, "Do you have any...nails?" The bartender, astonished, says, "No."
The duck continues, "Good, do you have any raisins?"