I don’t know about you, but I’ve seen the tree swing cartoon a million times.  It’s a great cartoon that illustrates the difference between what the user wants and how it’s interpreted by various groups in engineering.  I’d never seen it attributed to anyone, and as I learned today, its origins have now been lost.  There’s lots of variations of it, too.  That article is an interesting one about the history and variations that the author has been able to track down.