人に迷惑をかけなるな (hito ni meiwaku wo kakeru na)
That’s what my Japanese teacher (先生) told us in class.
She gave an example that she usually sits upright in the plane because she feels when she does it, it will give trouble to the person behind her.
How about if the person in front of you do it? It’s a trouble to her, but at least she didn’t do it to others.