A duck walks into a bar

and asks the bartender, "Got any grapes"
He says "No, why?"
The duck just walks away
The next day he comes back and asks for the same thing
The bartender says, annoyed, "No, we didn't have any yesterday, and won't have them tommorow, or ever"
The duck just walks away
The next day the duck asks for grapes again
The bartender, steaming angry at this point yells "LOOK DUCK! I'VE TOLD YOU 2 TIMES ALREADY, WE DON'T HAVE GRAPES. IF YOU ASK FOR GRAPES AGAIN, ILL NAIL YOU TO A WALL"
The duck looks at him for a minute then says "Got any nails?"
The bartender, confused, says "No... why?"
The duck then says "Good. Got any grapes?"