[js1138]

I kind of remember these two classics:

If you remember them you should rember their source. I don't remember either.

It has been known for a long time that the crack of a whip is caused by its tip exceeding the speed of sound -- propelled by a human hand.

And long before airplanes could survive exceeding the speed of sound, German V2s were pounding London at speeds greater than sound.

[Bloody Sam Roberts]

Gee whiz prof, I just don't happen to have all my reference books with me at work. I guess since you don't remember ever hearing it, it must not have ever been said. Sorry. My error. Just give me an "F" for today's class.