“All your Klattu are belong to us.”
Just thought I’d point out that the words (though not always in that order) appear in a computer game called Sacrifice. They are three of a whole host of arcane sounding words (quite a few of which pop up elsewhere) that are randomly put together to form spell incantations.
It is funny when a wizard chants “Klaatu, Barada, Nikto,” a loud cow moo is heard, and a bovine sails through the air and causes whatever it lands on to explode. “Bovine Intervention” remains one of my favorite magical effects just for sheer silliness. 
Once, before he adressed the nation, Reagan, not knowing that the microphone was on, said, “We have some great news. Congress has enacted legislation that outlaws klaatu barada nikto forever. We begin bombing in five minutes.”
*Three Rings for the Elven-kings under the sky,
Seven for the Dwarf-lords in their halls of stone,
Nine for the Mortal Men doomed to die,
One for the Dark Lord on his dark throne
In the Land of Mordor where the Shadows lie.
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the Land of Mordor Where the klaatu barada nikto.*
To pinch a phrase from Michael Ellis:
Feck!
Arse!
What…?