Jimmy Neutron Easter Egg - Klaatu Barada Nikto

This is a quote from an easter egg for the movie Army Of Darkness:
"In order to destroy the book of the dead, the hero must memorize and say the words "Klaatu barada nikto" This is a tribute to The Day the Earth Stood Still. In that movie the alien instructs the girl to memorize and say the codewords "Klaatu barada nikto" to stop the robot from attacking." -submitted by daunrealist

In the Jimmy Neutron episode where Jimmy's Dad says how he could've invested in McSpanky's Burger Factory, Jimmy, Carl and Sheen go back in time to tell his dad to invest. When they first see them, Carl says, "Klaatu Barada Nikto," in reference to The Day the Earth Stood Still. This phrase, however, is being rather common.