Not really. Not physical assault. I don't know how to categorize this one incident I had when I was on the train on my way to work. I was near the door, so people won't really press themselves against me. However, this one guy kept on getting close to me even though the space behind him was still too big.
I told him "Do you mind? The space behind you is still too big, right?" He backed off then, but I already know that he was a pervert. Funny thing was, we had the same destination. We worked on the same building, too. When he saw me that day, he quickly ran out of the common canteen.
What a pervert.