"It's called a changeover. The movie goes on, and nobody in the audience has any idea".

My mom told me that when she was young (in the 70s) that they would slip scary ass shit into 1 frame of a scary movie to really scare you. Like you wouldn't consciously see it, but your unconscious would. 

I wonder if that is true. I've Googled it but can't find confirmation one way or the other.

Founder of the /success channel. Search Marketing Director at Kraken Kratom. 

absolutely true dude, hah remember they used to do it in Fight Club too