All Play, No Work
Looking back at first grade, it seems all we ever did was draw, play, sing and generally have fun. As we moved up a grade, lessons became harder and school turned more demanding, which is understandable, but also much less fun.
This teacher decided to become a first grade teacher so that her students would always look back and remember how much they loved her. Unlike the horrible math teacher they will have in the not so distant future, for example.