Yesterday: One of my students came back to music lessons after the Christmas break, and while I was speaking with his mother, he walked into the lesson room and started playing his recorder. His mother's comment: "Do you think he wanted to come back to music?"
Made even better by the fact that he's autistic and I know he has trouble transitioning back into things after a long break, so coming back enthusiastically after 4 weeks means he really enjoys the lessons.