It's strange to think how moments in time are captured, people as they were - the actors on screen obviously as a more perfect facsimile, but also our own memories of certain moments of our life, long ago, the people we were with maybe gone, but all brought back in an instant and the feelings we had.
Yes...even a sound or a certain smell can do that. That's why it's important to shield children from seeing or experiencing certain things because of how impressionable they are and how easily their brains are imprinted. Imagine when a child sees some violent movie or stumbles upon some pornography as many now do and what negative impression it might have have on them later.