[Boris and Natasha attempt to trick Rocky and Bullwinkle into falling down a mine shaft]
Natasha Fatale: But how you'll get them?
Boris Badenov: Easy. I change sign.
Narrator: And quickly Boris replaced the danger sign on the shaft with one which said "Elevator. Up Only." Then, the two villains retired to see if their plan would work.
Natasha Fatale: Boris, what kind of idiot would try to go up in elevator shaft that goes only down?
Boris Badenov: THAT kind of idiot.
Bullwinkle J. Moose: [approaches the mine shaft] Hey, Rocky, our problem is solved.