A duck walks into a bar, goes up to the bartender, and asks, "Do you have any grapes?"
The bartender is surprised. "No, we don't have any grapes. But I'll be happy to make you a drink."
The duck says, "That's all right," and leaves.
The next day, the same duck walks back in and again asks, "Do you have any grapes?"
The bartender replies. "No, we serve alcohol, not grapes. You might try the grocery store down the street."
The duck says, "No, thanks anyway," and leaves.
This goes on for several days in the same way. Finally the bartender loses his patience. "No, we have absolutely no grapes here! If you come in here and ask again, Iām going to nail your beak to the floor!"
The duck says, "Okay then," and leaves.
The next day the duck is back. He goes up to the bartender and asks, "Do you have any nails?"
The bartender is taken aback. "No, we don't have any nails here."
"Great!" says the duck. "Do you have any grapes?"