Bubble in the Bath

A new lady teacher came to teach 8th standard students. As it was the first day, she gave her introduction, and asked all the students to introduce themselves with name and hobby. She said, "Let's start with the boys first”. The boys start giving their introduction.
First boy: "My name is John, and my hobby is to see bubble in the bathtub".
Teacher was confused to listen but said, "Interesting. Well, Ok. In fact we must be honest in telling the hobby. After all, there’s essentially a child in each of us. So it's ok John. Yes next".
Second boy: "Myself Peter and my hobby is to see bubble in the bathtub".
Teacher now got surprised and said, "Good. I like the spirit of supporting a friend. Ok next".
Third boy: "I'm Smith and my hobby is to see bubble in the bathtub".
Teacher: "Guys are you joking or what? Please be sincere. Ok next".
This continues, and the last boy stands up "I'm Harry and my hobby is to see bubble in the bathtub".
Exhausted, the teacher said, "I don't think I will be able to teach immature boys for long. Anyway, now the girls please”.
First girl: "I'm Julie and my hobby is to see birds".
Teacher: "Good. At last I got something different. Ok next".
Second girl: "I'm Ruby and I like to collect perfumes”
Teacher "Now that’s like educated grown up girls. Ok next. You sweet girl; Yes you...” The most beautiful girl ... {full joke}