Firefox has a cool little easter egg, just type in about:robots in the address bar & you will find robots greeting you with a special message. The title of the page reads Gort! Klaatu barada nikto!, wondering what it means. According to wikipedia Gort! Klaatu barada nikto! originates from the Cold War-era science fiction film The Day the Earth Stood Still (1951). In the film, the phrase, Klaatu barada nikto, was used by Helen Benson to stop the robot Gort from destroying the Earth. Klaatu is the name of the humanoid alien protagonist in the film. Here is a quick view of the page..

If you didn’t know what are easter eggs than point to this page on Wikipedia .