Look, no matter what a smashing jokester you are, it sometimes happens that for whatever reason, you don’t get the joke at all. Blame it on the full moon, your new haircut, or you name it. But missing ...

As odd as it might sound, the third line of Act 2, Scene 3 of Shakespeare's Macbeth includes the words "knock, knock" and "who's there?" In fact, this scene-which opens with a drunken porter answering ...