How right you are!
"Klaatu barada nikto" is the secret message that the alien
Klaatu (played by Michael Rennie) gives to the human Helen Benson (played by
Patricia Neal) to keep the robot Gort (played by Lock Martin, though you'd never
know it) from destroying the Earth after we (temporarily) kill Klaatu. It may
be a good phrase to remember when any of the machines in your life start acting
up.