(Boris and Natasha attempt to trick Rocky and Bullwinkle into falling down a mine shaft)
Natasha: But how you'll get them?
Boris: 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: Boris, what kind of idiot would try to go up in elevator shaft that goes only down?
Boris: That kind of idiot.
Bullwinkle: (approaching the mine shaft) Hey, Rocky, our problem is solved.