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 Spreadsheet
Type the following in an empty field
=GAME("StarWars")
Gnome Easter Egg
Type the following in Login Screen when it ask for username
Require Quarter Then press enter
nothing will happened
now you can enter your username and password as usual
now you can see a surprise before login
don't worry press OK to continue
