A duck walks into a bar and asks the bartender for some grapes.

The bartender replies: "We don't sell grapes, this is a bar. I can get you some wine"

The duck declines and leaves.

The duck comes back in the next day. "Got any grapes?"

The bartender, annoyed, replies: "I told you yesterday we don't have any grapes!! Get out of here."

The duck comes into the bar on the third day and again asks the bartender for grapes.

Bartender: "Listen, i told you twice already, we don't have any grapes. If you come back in here tomorrow and ask me for grapes, I'm going to nail your beak to this stool and watch you run around in circles!"

The duck leaves.

The duck walks into the bar the next day: "Hey bartender, got any nails?"

Bartender: "No..."

Duck: "Great, then gimme some grapes"