Easter eggs are messages, videos, graphics, sound effects, or an unusual change in program behavior that sometimes occur in a software program in response to some undocumented set of commands, mouse clicks, keystrokes. Here You can see some simple easter eggs in Ubuntu.
OpenOffice Easter Egg
Select OpenOffice Spreadsheet Applications-->
Office-->
OpenOffice.org SpreadsheetType the following in an empty field
=GAME("StarWars")
Gnome Easter EggType the following in
Login Screen when it ask for
usernameRequire Quarter Then press enter
nothing will happenednow you can enter your username and password as usual
now you can see a surprise before login
don't worry press OK to continue