A duck walks into a bar and asks the barman for a slice of bread.
“We don’t serve bread. This is a pub,” the barman said. And with that, the duck left.
An hour later, the duck was back. “Can I have a slice of bread?” he asked.
The barman replied: “I’ve already told you. This is a pub. We don’t serve bread.” And the duck left.
Another hour passed and the duck returned, and asked again for a slice of bread.
The barman again replied, somewhat louder than before, that they did not serve bread.
The duck left, but again returned an hour later. “Can I have a slice of bread please?”
The barman, now somewhat exasperated, said: “No. Go away. And if you come back here asking for a slice of bread again, I’m going to nail your beak to this bar.”
The duck left. But, undeterred, he returned an hour later.
“Have you got any nails?” he asked.
“No!”, the barman said, somewhat confused.
“Can I have a slice of bread then please…”