A little duck walks into a bar one day. He saunters up to the bartender and asks, “Got any gwapes?” “Nope, sorry,” says the bartender. The duck walks out, disappointed.
The next day, the duck walks into the bar again and asks, “Got any gwapes?” “I already told you, no, I don’t!” says the bartender angrily. The duck leaves, again disappointed.
The day after that, the duck walks in again and says, “Got any gwapes?” “No! I do not have any grapes! If you come in here one more time asking for grapes I’ll nail your feet to the floor!”
The next day, the duck waddles into the bar. The bartender eyes him suspiciously. “Got any nails?” the duck asks. “No, why?” the bartender asks. “Got any gwapes?”
… Author unknown