A ducks walks into a bar and asks, "Got any grapes? " The bartender, confused, tells the ducks that no, his bar doesn't serve grapes. The duck thanks him and leaves. The next day, the duck returns and says, "Got any grapes? " Again, the bartender tells him that, no, the bar does not serve grapes, has never served grapes, and, furthermore, will never serve grapes. The duck, a little ruffled, thanks him and leaves. The next day, the duck returns, but before he can say anything, the bartender begins to yell: ''Listen, duck! This is a bar! We do not serve grapes! If you ever ask for grapes again,...