A duck walks into a bar. He goes up to the bartender and says “Got any grapes?” The bartender says “No” so the duck leaves. The duck comes back the next day, goes up to the bartender, and says “Got any grapes?” The bartender says “No” so the duck leaves.
The next day the duck comes back again. He goes up to the bartender and says “Got any grapes?”
The bartender says “Look duck. We don’t have any grapes today, we didn’t have any yesterday, and we definitely won’t have any tomorrow. If you come back in here and ask for grapes again, I’m going to nail your webbed feet to the floor.”
So the duck leaves. The duck comes back the next day, goes up to the bartender and asks “Got any nails?” The bartender says “No.” Then the duck says “Oh good. Got any grapes?”