A duck walks into a bar, sits on a stool, and asks the barman. "Do you have any bread?"
The barman replies "no."
The duck repeats himself "Do you have any bread?"
The barman scowls "I said no, we don't"
The duck continues "Do you have any bread?"
The barman slams his hands down on the bar "No! And if you ask again I'll nail your bill to the bar!"
The duck pauses. "Do you have any nails?"
"No, why?" The barman scowls
"Do you have any bread?"