The Monocle Test

Sir Robarts performs the monocle test on everyone who comes into his office. He stares at them and questions them while looking through his small glass monocle, which shines light on their faces like an inquisitor's light. If the people being questioned flinch, then they are usually lying.

The monocle test is symbolic simply because it doesn't work. It's ostensibly the symbol for truth, but ultimately it symbolizes the idea that there is no certainty about the truth. The characters don't seem to have the necessary conscience to fail the test.

Additionally, Christine's movement to close the blinds and stop the test should immediately clue viewers into the fact that something suspicious is going on with her. She realizes that although she loves Leonard, she could easily give them away with that type of "truth serum" and puts a stop to the test. Both viewers and...