Taking pictures of people in trains makes people angry.
When I was in Japan riding the train there were these weird looking people. I took a picture of them for some reason I forget why.
They stared at me the whole time for about an hour.
There was this one time on the train were a Chikan(train pervert that rubs body against you or cops a feel) He was sitting by himself talking yelling/crying about how he wil never touch another girl on the train and how sorry he was for touching girls on the train. Everyone on the train was looking at him and laughing.
Another time in Japan at the train station there were a Chinese group and the old Chinese lady she must have been like 80 got mad and started smacking the other Chinese guy's head.