All the worst things I learned in life, I learned in second grade. Second grade happened in 1956–57 for me, and it was mostly about discovering human limitations, including mine.
Starting into the school year, I was doing fine. I had got through all of first grade without the teacher ever being able to make me listen to her. So I thought it was going to be like that for the duration. That meant I could do what you were supposed to do in school, namely learn stuff, without having to worry about interference from a stupid adult.