A duck walks into a bar.
He perches himself up on a barstool and asks the bartender,
"Can I have some grapes?" The bartender says "sorry, we don't have any grapes." So the duck leaves.
The next day the duck returns and asks "Can I have some grapes?" The bartender, looking a little anoyed, says "I told you, we don't have any grapes." So the duck leaves.
The next day the duck comes in again. The bartender looks really annoyed by now as the duck says "Can I have some grapes?" The bartender says "LOOK! I TOLD YOU WE DON'T HAVE ANY GRAPES! THIS IS A BAR! WE GOT WHISKEY, RUM AND BEER, BUT NO GRAPES! IF YOU COME IN HERE ONE MORE TIME ASKING FOR GRAPES, I'M GONNA NAIL YOUR BEAK TO THIS BAR!"
So the duck leaves.
Next day the duck returns and once again hops up onto the barstool. The bartender comes over and says with an angry look, "Yeah?..."
The duck says "Can I have some nails?" The bartender explodes and says "LOOK, THIS IS A BAR, NOT A HARDWARE STORE! OF COURSE I DON'T HAVE ANY NAILS!!"
So the duck thinks it over and says "Good. Can I have some grapes?"