At what moment did あなた mumble one of MJ's songs?

I was in art class and the teacher asked a 質問 why are humans want everything aka greedy and she asked another 質問 is it because it's human nature then 発言しました explain.
I thought of MJ's song human nature i was thinking why why tell them that it is human nature. Just not explainable but i did not answer with mj's lyrics because i am shy :)