Hello Teacher, Hello Teacher, Hello...Cake?

For the past few weeks I have been teaching my middle class (the children who are about five years old) a song called “Hello Teacher”. It is to the tune of “Goodnight Ladies” but the words are: “Hello teacher, hello teacher, hello teacher, hello and how are you?” In order to practice the children’s English names, we sing the song to the students individually using their English names. So, for example, if I have a student named Lily, then Lily will come up to the front with me and we will all sing: “Hello Lily, hello Lily, hello Lily, hello and how are you?”
But that is just background information. What I want you to get out of the above is to be familiar with the song that I taught one of my classes and also to know that they understand how to substitute different names into the song. Now for my story, which I think is really cute (but then again, I think most of the things that happen in my classes are cute).
Today we had practiced the song I mentioned above and later on during the class, almost near the end, one of the parents came into the classroom with cake because it was one of the children’s birthdays. Of course, as soon as the children saw the cake, they forgot what I was teaching them at the moment (I understand – cake is exciting). However, they started singing, without any prompting, a new version of the English song I had taught them! They started singing “Hello 蛋糕 (dangao)，hello 蛋糕, hello 蛋糕, hello and how are you?” In Chinese, dangao is cake, so in essence, they started singing hello to the cake because they were so excited about it. It was really cute, though, to see them singing to/about the cake, and it was wonderful to hear them singing an English song that I had taught them – to know that I am teaching them something that they are remembering and using. Hearing them sing the new version of my song made me and all of the Chinese teachers in the room laugh.