Sounds like you experienced that many times, but does it really happen often?
I mean, I haven neither seen the actual occasion nor heard my female friends say that kind of thing.(seeing it is almost impossible to happen though, cause they pretend it is caused by jiggle, right?)
I heard my mum say that some creepy guy sat down really close to her in desserted train so she felt something was wrong and decided to leave there, but during going to other compartment, she got some sense of being stalked.
When she turned back, the guy was staring at her in front of her, she just ran away screaming and eventually got off at station which wasn't her destination.
I think that must've been at least 25 years ago. I got surprised when I heard this story cause I can't really imagine there were stalkers at the time.
I'm sick of hearing this story from her over and over again, she thinks it is kind of evidence that she was pretty when she was young.