Friend of mine showed me a link to this video (http://www.youtube.com/watch?v=b-OhjAD937s) showing some easter eggs that can be done within Ubuntu’s terminal.
Apparently it can be done on any linux terminal, as long as you have the correct version of apt or aptitude installed, so give it a try and enjoy!
The commands that can be run are:
aptitude moo -v
aptitude moo -vv
aptitude moo -vvv
aptitude moo -vvvv
aptitude moo -vvvvv
aptitude moo -vvvvvv