We focused on flaws of intuition and of intuitive thinking, and I can tell you how it began. It began with a conversation about whether people are good intuitive statisticians or not. There was a claim at the University of Michigan by some people with whom Amos had studied, that people are good intuitive statisticians. I was teaching statistics at the time, and I was convinced that this was completely false. Not only because my students were not good intuitive statisticians, but because I knew I wasn't. My intuitions about things were quite poor, in fact, and this has remained one of the mysteries, and it's one of the things that I'd like to talk about today — what are the difficulties of statistical thinking, and why is it so difficult.