A Lesson from Happiness

In a recovered diary of Pinkamena Diane Pie, she recalls the moment she found out how important a smile really is.

Based on the events in the episode, "The Cutiemark Chronicles."

In a recovered diary of Pinkamena Diane Pie, she briefly reflects on the time she saw the sonic rainbom and the lesson in happiness that she learned from it. She learns how important a smile really is.