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Easter egg

Easter egg: [from the custom of the Easter Egg hunt observed in
   the U.S. and many parts of Europe] n. 1. A message hidden in the
   object code of a program as a joke, intended to be found by persons
   disassembling or browsing the code.  2. A message, graphic, or
   sound effect emitted by a program (or, on a PC, the BIOS ROM) in
   response to some undocumented set of commands or keystrokes,
   intended as a joke or to display program credits.  One well-known
   early Easter egg found in a couple of OSes caused them to respond
   to the command `make love' with `not war?'.  Many
   personal computers have much more elaborate eggs hidden in ROM,
   including lists of the developers' names, political exhortations,
   snatches of music, and (in one case) graphics images of the entire
   development team.