How a dogcow from Cairo came to grace the Page Setup dialog in Classic Mac OS, was retired for Mac OS X, and has made a comeback since Ventura.
Easter egg
Click on the amber button at the top left of a window to minimise it into the Dock. And you have a choice of four speeds.
Hidden deep in domain names are the lyrics to a Joss Whedon song, from an Internet musical.
The Eclectic Light Company 