Logic
From Tardis Wiki, the free Doctor Who reference
The Cyber-tomb on Telos was based on symbolic logic. (TV: The Tomb of the Cybermen)
The Second Doctor told Zoe Heriot that logic merely enabled one to be wrong with authority. (TV: The Wheel in Space)
According to the Sixth Doctor, the only logic in the Matrix was that there was not any logic. (TV: The Ultimate Foe)
