An episode of the legendary television series The Prisoner
. In it, our protagonist Number 6
is 'replaced' by a body double
, and is given brainwashing
to make him believe that he is the duplicate of himself in order to confuse him and make him confess why he resigned
. The phrase is also the password
used in this episode to allow the speaker past the security robot known in the series as Rover
One of my favorites of the 17 installments of one of the best shows ever made. There is an eposide of Star Trek: TNG entitled The Schizoid Man which, I believe, is done in homage to this series.