The Graphing Calculator Story
Ron Avitzur (via Rentzsch):
We finished in January 1994. Graphing Calculator has been part of the Macintosh ever since. Teachers around the world use it as an animated blackboard to illustrate abstract concepts visually. It shipped on more than twenty million machines. It never officially existed.
Update (2020-09-07): See also: Avitzur’s Google TechTalk (via Dave Mark).