oh here's another!
So, a duck walks into a bar. He hops up on one of the barstools and asks, "Hey, you got any grapes?"
The bartender says, "No, this is a bar, we don't have any grapes." So the duck leaves.
The next day, the duck comes back, and asks, "Hey, you got any grapes?"
The bartender says, "No. This is a bar. We don't have any grapes." So the duck leaves.
The next day, the duck comes into the bar, and asks, "Hey, you got any grapes?"
The bartender grabs the duck by the neck, and says, "Look, duck, this is a bar. We don't have any grapes. If you come in here again and ask for grapes I am going to nail your webbed feet to this bar."
So the duck leaves.
The next day, the duck comes into the bar, and askes, "Hey, you got any nails?"
"Well, no. This is a bar, we don't have any nails."
"Got any grapes?"