First grade is very exciting

At our first-grader’s beginning of school celebration last week, we noticed that one of the kids from his kindergarten class had been kept behind to repeat another year. My husband and I whispered to each other, “Why do you think he got left behind?” and then my 7 year old leaned over and said, “Oh, I know why.  It’s because he has an arch enemy in first grade.”

Of course.  I should have guessed.