Are we truly rational? In this video, we explore the concept of rationality through epic battles of wit, like the one in The Princess Bride, and key moments from Sherlock and Friends. Discover how game theory and the idea of common knowledge of rationality influence our decisions and what it really means to be rational. Are you ready to see how far your own iterations of “I know that you know that I know” can go? Get ready to have your mind blown with paradoxes and strategic surprises!