Everyone in Tokyo has a commuting horror story, but sometimes you need to see an example of some really rough behavior on the trains with your own eyes to understand just how bad some people have it.

An act of violence recorded on a smartphone in Shinjuku Station attracted plenty of attention online recently. Viewers were shocked to see a man specifically targeting women — although it didn’t take long before some commenters spoke up to say that such behavior wasn’t altogether out of the ordinary.

On the evening of May 25, Twitter user @____s__7_ uploaded a video that showed footage of a man from behind as he walked through Shinjuku Station wearing a backpack.