That is the name of this fascinating guessing game that I stumbled upon as I was reading “The Biggest Bluff” by Maria Konnikova. This game was invented in the early 2000s by two poker players, Antonio Esfandiari and Phil Laak. According to poker legend, they spontaneously decided to spice things up during the grind of a high-stakes poker tournament in Europe by asking a third party (fellow poker player Johnny Lodden, pictured below top left) a random question, such as “How old is Clint Eastwood?” Laak and Esfandiari then agreed to bet on what they thought Lodden’s answer would be. To keep the game honest, I imagine that Laak and Esfandari asked Lodden to write down his answer ahead of time. Either way, what I find so fascinating about this game is that the true answer to the original question doesn’t matter; the only thing that matters is what Laak and Esfandari think Lodden’s answer will be. In fact, it does not matter what the questions are either–the crazier the question the better! More details here.