In my first job as a bank teller, I was robbed at gunpoint by a man I described in great detail to the FBI. I was 100% confident in my description. Bank security video showed an entirely different person robbing me. Not even close.
Weirdly, it wasn't a frightening experience, at least for me. In those days, metro banks were getting robbed so often it was fairly routine. I can't recall ever being afraid of another human, even when I should have been.