Do You Have Any Corn?

One day a man walks into a bar and asks the bartender, “Do you have any corn?” and the bartender says, “No, we only sell beer.”
The next day the man walks into the bar again and asks for corn but this time the bartender says, “Hey, you are the guy that asked for corn yesterday? If you ask for corn one more time i will nail you to the wall!”
The next day the man goes into the bar again and asks, “Do you have any nails?” and the bartender says, “No,” so the man says, “Do you have any corn?”