Duck goes into a bar and says to the barman "Got any grapes?"
Barman: Nope, don't sell fruit.
Duck leaves
Next night Duck goes into the same bar "Got any grapes?"
Barman: Nope, told you last night, don't sell fruit!
Next night Duck goes back again "Got any grapes?"
Barman: "Look YOU! Told you last night AND the night before WE DON'T SELL FRUIT. If you come back here again I'll nail your beak to the bar!!!!!"
Duck says "okay okay Jeeeesus, calm down"
Next day, duck goes into the bar again. "Got any nails?"
Barman: NO
Duck: Got any grapes then???