A duck walks into quickie mart and asks the guy behind the counter
"Hey, ya got any grapes?"
Counter guy replies "No, we don't sell grapes here, it's a quickie mart."
The duck goes away, but comes back the next day and again asks,
"Hey, ya got any grapes?"
The guy says "No, I told you yesterday that we don't have any grapes, now go away!"
Duck comes back the next and again asks,
"Hey, ya got any grapes?"
Guy says, "Look, I've already told you twice we don't have any damn grapes and if you come back again I'll nail your beak to the floor!"
Duck comes back in the next day and asks,
"Hey, ya got any nails?"
Guy says, "Um, no."
Duck says, "Good, ya got any grapes?"