Duck

A duck walks into a bar and asks the bartender -- do you have cheese? The bartender say NO, this is a bar -- we don't serve cheese here. The next day the duck walks back into the bar and asks -- do you have cheese? The bartender again says NO, I told you, this is a bar -- we don't have cheese here. Again, the very next day the duck returns to the bar and asks the bartender -- do you have cheese? The bartenders says, No - I told you, this is a bar and we don't have cheese here and if you come back tomorrow I'm going to nail you to the wall and use you as a dartboard! The next day the duck comes back to the bar and asks -- do you have nails? The bartender says, NO - the duck says - do you have cheese?