I have had this issue for as long as I can remember it does not happen as often now as it did before but during times of depression, they come back full-force. Sometimes for no reason at all I get flashes of people I love or strangers getting graphically hurt the imagery is so realistic I gasp and react at the moment, for example, i could be waiting for the train, and I would just look down the platform to see everyone else waiting for the train and suddenly the train starts approaching the station and I see people being pushed into the tracks by some crazy homeless man I call them flashes because they don't last longer than a couple of seconds. Most of the time its very graphic, I'm never injuring anyone I just see them get hurt and get alarmed, sometimes I will even see huge open wounds on my face, but those are rare. I always wanted to know what this meant but never had the courage to tell anyone.