Duck walks into a bar, says, "Got any grapes?"
The bartender says, "No, get out of here, we don't serve ducks."
The next night, the duck walks back into the bar, says, "Got any grapes?"
The bartender says, "No, we don't have any grapes, now get out of here!"
The next night, in comes the duck, says, "Got any grapes?"
The bartender flips out, starts yelling and pounding his fist on the bar, says "No, we don't got any grapes, you damn duck, and if you come back in here, I'm gonna nail your little webbed feet to the bar!"
The next night, the duck walks into the bar, says, "Got any nails?
"No."
"Got any grapes?"