Xeyes
Xeyes is a graphical computer program showing on the screen two googly eyes that follow the mouse movements as if they were watching this. The manual page for the X Window system, according to the program originally developed by Jeremy Huxtable was written for the NeWS system in 1988 and presented at the SIGGRAPH conference. It was then ported to X11 by Keith Packard after. His popularity stemmed from the fact that it is run automatically when you start the graphical user interface in many installations.
Many similar programs have been developed for X and other systems, such as Windows and Java.
The manual page xeyes usually jokingly claimed that the program reports the activities of each user an unspecified "Boss".