A bit of a TAAT but I want to know how common this amongst us - not a scientific poll by any margin but curious nonetheless.
I was once grabbed by a man on the tube and when I went to move away he grabbed me again. The first time I thought was an accident but the second time I knew it was considered. I was told by the guard on the platform that sometimes people have bad days - fair enough, but never on any of my bad days did I think to grab a random commuter.