If you ask, What is a non sequitur? And I say, “Blue love on a blue moon on Mr. Green’s greenback printing machine (the one that sounds like Weimar Germany in 1923)”, then I have given you an example of a non sequitur. But since you asked what a non sequitur was, the fact that I gave you a non sequitur as an answer means it most definitely is not a non sequitur, since it does follow logically. Because it is means that it isn’t. But because I gave you what you wanted, when you wanted what you didn’t want, then I didn’t give you what you wanted, thus giving you what you wanted. So it is a non sequitur, which means it isn’t. But since it isn’t, when you expected it to be one, signals that it is. So it is and it isn’t, all at the same time!