Emotioal triggers in "The Snake Pit" and "Gaslight.".... in General Discussions Posted July 17, 2016 I wonder if certain movies trigger flashbacks or PTSD -- for example, if war movies trigger PTSD. It could be something as innocent as seeing a certain breed of dog. I just remember watching Ingrid in Gaslight, and feeling it happen to me. I got the same creepy tingle watching a Snake Pit scene. I was able to watch it twice this week.