The Princess Bride

Common Knowledge and Rationality

In this fantastic movie, one scene highlights the humorous side of common knowledge. Perhaps more importantly, it highlights the notion of strategic moves that we will encounter. When the rules of the game are flexible, you can guarantee victory by manipulating the rules to your advantage!

The Man in Black (the good guy) challenges Vizzini (bad) to a battle of wits. The battle consists of the good guy poisoning one of two glasses, and having his foe select which one to drink.