Aha....
A duck walks into a bar. Says "Got any bread?"
"No," says the barman, and the duck walks off.
Duck comes back next day, "got any bread?"
"Didn't I tell you yesterday?" says the barman, "NO!" - duck walks off.
Third day - "got any bread"
"Look, I'm getting tired of this. NO, we don't have any bread. GO AWAY." - duck walks off.
Fourth day - "got any bread?"
"Right," says the barman, "I'm smurfing sick of this. If you ask me that one more time, I'll nail your beak to the bar!" - duck walks off.
Fifth day - "got any nails?"
Barman looks confused. "Erm, no?"
"Good," says the duck.
(SPOILER)"Got any bread?"