Coercive logic
I escaped from my captors because they forgot to say "in the negative" instead of "'no'" when they were interrogating me with coercive logic. So I was able to answer "nope", which was a correct and consistent negative answer and nonetheless allowed me to get away.
Other prisoners were not so lucky, and were forced to sit at a desk for years, calculating by hand the explicit numerical value of the Gödel number of "This statement has no proof in Principia Mathematica".
